There are essentially two types of legal mortgage.
Mortgage by demise
In a mortgage by demise, the creditor becomes the owner of the mortgaged property until the loan is repaid in full (known as "redemption"). This kind of mortgage takes the form of a conveyance of the property to the creditor, with a condition that the property will be returned on redemption. This is an older form of legal mortgage and is less common than a mortgage by legal charge. It is no longer available in the UK, by virtue of the Land Registration Act 2002.
Mortgage by legal charge
In a mortgage by legal charge, the debtor remains the legal owner of the property, but the creditor gains sufficient rights over it to enable them to enforce their security, such as a right to take possession of the property or sell it.
To protect the lender, a mortgage by legal charge is usually recorded in a public register. Since mortgage debt is often the largest debt owed by the debtor, banks and other mortgage lenders run title searches of the real property to make certain that there are no mortgages already registered on the debtor's property which might have higher priority. Tax liens, in some cases, will come ahead of mortgages. For this reason, if a borrower has delinquent property taxes, the bank will often pay them to prevent the lienholder from foreclosing and wiping out the mortgage.
This type of mortgage is common in the United States and, since 1925, it has been the usual form of mortgage in England and Wales. In Scotland, the mortgage by legal charge is also known as standard security.
At common law, a mortgage was a conveyance of land that on its face was absolute and conveyed a fee simple estate, but which was in fact conditional, and would be of no effect if certain conditions were not met --- usually, but not necessarily, the repayment of a debt to the original landowner. Hence the word "mortgage," Law French for "dead pledge;" that is, it was absolute in form, and unlike a "live gage", was not conditionally dependent on its repayment solely from raising and selling crops or livestock, or of simply giving the fruits of crops and livestock coming from the land that was mortgaged. The mortgage debt remained in effect whether or not the land could successfully produce enough income to repay the debt. In theory, a mortgage required no further steps to be taken by the creditor, such as acceptance of crops and livestock, for repayment.
The difficulty with this arrangement was that the lender was absolute owner of the property and could sell it, or refuse to reconvey it to the borrower, who was in a weak position. Increasingly the courts of equity began to protect the borrower's interests, so that a borrower came to have an absolute right to insist on reconveyance on redemption. This right of the borrower is known as the "equity of redemption".
This arrangement, whereby the mortgagee (the lender) was on theory the absolute owner, but in practice had few of the practical rights of ownership, was seen in many jurisdictions as being awkwardly artificial. By statute the common law position was altered so that the mortgagor would retain ownership, but the mortgagee's rights, such as foreclosure, the power of sale and the right to take possession would be protected.
In the United States, those states that have reformed the nature of mortgages in this way are known as lien states. A similar effect was achieved in England and Wales by the Law of Property Act 1925, which abolished mortgages by the conveyance of a fee simple.

A mortgage is a method of using property (real or personal) as security for the payment of a debt. The term mortgage (from Law French, lit. death vow) refers to the legal device used in securing the property, but it is also commonly used to refer to the debt secured by the mortgage, the mortgage loan. In most jurisdictions mortgages are strongly associated with loans secured on real estate rather than other property and in some cases only land may be mortgaged. Arranging a mortgage is seen as the standard method by which individuals and businesses can purchase residential and commercial real estate without the need to pay the full value immediately.
In many countries it is normal for home purchases to be funded by a mortgage. In countries where the demand for home ownership is highest, strong domestic markets have developed, notably in Spain, the United Kingdom and the United States.
Participants and variant terminologyLegal systems tend to share certain concepts but vary in the terminology and jargon they use. In general terms the main participants in a mortgage are:
Creditor
The creditor has legal rights to the debt secured by the mortgage and often makes a loan to the debtor of the purchase money for the property. Typically, creditors are banks, insurers or other financial institutions who make loans available for the purpose of real estate purchase. A creditor is sometimes referred to as the mortgagee or lender.
Debtor
The debtor[s] must meet the requirements of the mortgage conditions (and often the loan conditions) imposed by the creditor in order to avoid the creditor enacting provisions of the mortgage to recover the debt. Typically the debtors will be the individual home-owners, landlords or businesses who are purchasing their property by way of a loan. A debtor is sometimes referred to as the mortgagor, borrower, or obligor.
Other participants
Due to the complicated legal exchange, or conveyance, of the property, one or both of the main participants are likely to require legal representation. The terminology varies with legal jurisdiction; see lawyer, solicitor and conveyancer.
Because of the complex nature of many markets the debtor may approach a mortgage broker or financial adviser to help them source an appropriate creditor typically by finding the most competitive loan. Recently, many US consumers (particularly higher income borrowers) are choosing to work with Certified Mortgage Planners, industry experts that work closely with Certified Financial Planners to align the home finance position(s) of homeowners with their larger financial portfolio(s).
The debt is sometimes referred to as the hypothecation, which may make use of the services of a hypothecary to assist in the hypothecation.
In addition to borrowers, lenders, government sponsored agencies, private agencies; there is also a fifth class of participants who are the source of funds - the Life Insurers, Pension Funds, etc.
Other TerminologiesLike any other legal system, the mortgage business sometimes uses confusing jargon. Below are some terms explained in brief.
Advance: This is the money you have borrowed plus all the additional fees.
Base Rate In UK: this is the base interest rate set by the Bank of England. In the United States, this value is set by the Federal Reserve and is known as the Discount Rate.
Bridging Loan: This is a temporary loan that enables the borrower to purchase a new property before the borrower is able to sell another current property.
Conveyance: This is the legal document that transfers ownership of unregistered land.
Disbursements: These are all the fees of the solicitors and governments, such as stamp duty, land registry, search fees, etc.
Early Redemption Charge / Pre-Payment Penalty / Redemption Penalty This is the amount of money due if the mortgage is paid in full before the time finished.
Equity: This is the market value of the property minus all loans outstanding on it.
First time buyer: This is the term given to a person buying property for the first time.
Freehold: This means the ownership of a property and the land.
Land Registration: This is a legal document that records the ownership of a property and land. This is also known as a Title.
Leasehold: This means the ownership of the property and land for a specified period, which may be sold separately from freehold, which may be owned by another person.
Legal Charge: This is a legal document that records the data of the rightful owner of a property or land.
Loan Origination Fee: A charge levied by a creditor for underwriting a loan. The fee often is expressed in points. A point is 1 percent of the loan amount.
Mortgage Deed: This is a legal document that stated that the lender has a legal charge over the property.
Mortgage Payment Protection Insurance :This is a form of insurance that ensures that the current mortgage payment will be paid if the borrower proves unable to do so.
Private Mortgage Insurance: This is a form of insurance the lender has the borrower take for loans over 80% of the appraised value. This will pay the lender only the owed portion up to 80% on a defaulted loan.
Sealing Fee: This is a fee made when the lender releases the legal charge over the property.
Subject To Contract: This is an agreement between seller and buyer before the actual contract is made.
Foreclosure and non-recourse lendingIn most jurisdictions, a lender may foreclose the mortgaged property if certain conditions - principally, non-payment of the mortgage loan - apply. Subject to local legal requirements, the property may then be sold. Any amounts received from the sale (net of costs) are applied to the original debt. In some jurisdictions, mortgage loans are non-recourse loans: if the funds recouped from sale of the mortgaged property are insufficient to cover the outstanding debt, the lender may not have recourse to the borrower after foreclosure. In other jurisdictions, the borrower remains responsible for any remaining debt. In virtually all jurisdictions, specific procedures for foreclosure and sale of the mortgaged property apply, and may be tightly regulated by the relevant government; in some jurisdictions, foreclosure and sale can occur quite rapidly, while in others, foreclosure may take many months or even years. In many countries, the ability of lenders to foreclose is extremely limited, and mortgage market development has been notably slower.