
Two types of mortgage instruments are commonly used in the United States: the mortgage (sometimes called a mortgage deed) and the deed of trust.
The mortgage
In all but a few states, a mortgage creates a lien (in law, a lien is a form of security interest granted over an item of property to secure the payment of a debt or performance of some other obligation. The owner of the property, who grants the lien, is referred to as the lienor and the person who has the benefit of the lien is referred to as the lienee) on the title to the mortgaged property. Foreclosure (foreclosure is the legal and professional proceeding in which a mortgagee, or other lien holder, usually a lender, obtains a court ordered termination of a mortgagor's equitable right of redemption. Usually a lender obtains a security interest from a borrower who mortgages or pledges an asset like a house to secure the loan. If the borrower defaults and the lender tries to repossess the property, courts of equity can grant the borrower the equitable right of redemption if the borrower repays the debt) of that lien almost always requires a judicial proceeding declaring the debt to be due and in default and ordering a sale of the property to pay the debt.

Security deed
The deed to secure debt is a mortgage instrument used in the state of Georgia. Unlike a mortgage, a security deed is an actual conveyance of real property in security of a debt. Upon the execution of such a deed, title passes to the grantee or beneficiary (usually lender), however the grantor (debtor) maintains equitable title to use and enjoy the conveyed land subject to compliance with debt obligations.
Security deeds must be recorded in the county where the land is located. Although there is no specific time within which such deeds must be filed, the failure to timely record the deed to secure debt may affect priority and therefore the ability to enforce the debt against the subject property.
The deed of trust
The deed of trust is a deed by the borrower to a trustee for the purposes of securing a debt. In most states, it also merely creates a lien on the title and not a title transfer, regardless of its terms. It differs from a mortgage in that, in many states, it can be foreclosed by a non-judicial sale held by the trustee. It is also possible to foreclose them through a judicial proceeding.
Most "mortgages" in California are actually deeds of trust. The effective difference is that the foreclosure process can be much faster for a deed of trust than for a mortgage, on the order of 3 months rather than a year. Because the foreclosure does not require actions by the court the transaction costs can be quite a bit less.

Deeds of trust to secure repayments of debts should not be confused with trust instruments(a trust instrument (also sometimes called a deed of trust, where executed by way of deed) is an instrument in writing executed by a settlor used to constitute a trust. Trust instruments are generally only used in relation to an inter vivos trust; testamentary trusts are usually created under a will) that are sometimes called deeds of trust but that are used to create trusts for other purposes, such as estate planning. Though there are superficial similarities in the form, many states hold deeds of trust to secure repayment of debts do not create true trust arrangements.
Mortgage lien priority: "title theory" and "lien theory"
Except in those few states in the United States that adhere to the title theory of mortgages, either a mortgage or a deed of trust will create a mortgage lien upon the title to the real property being mortgaged. The lien is said to "attach" to the title when the mortgage is signed by the mortgagor and delivered to the mortgagee and the mortgagor receives the funds whose repayment the mortgage secures. Subject to the requirements of the recording laws (the vast majority of states in the United States employ a system of recording instruments that affect the title of real estate as the exclusive means for publicly documenting land titles and interests. This system differs significantly from land registrations systems, such as the Torrens System that have been adopted in a few states. The principal difference is that the recording system does not determine who owns the title or interest involved. That determination is ultimately made through litigation in the courts. What the system does do is to provide framework for determining whom the law will protect with relation to those titles and interests when a dispute arises) of the state in which the land is located, this attachment establishes the priority of the mortgage lien with respect to most other liens on the property's title. Liens that have attached to the title before the mortgage lien are said to be senior to, or prior to, the mortgage lien. Those attaching afterward are said to be junior or subordinate. The purpose of this priority is to establish the order in which lien holders are entitled to foreclose their liens in an attempt to recover their debts. If there are multiple mortgage liens on the title to a property and the loan secured by a first mortgage is paid off, the second mortgage lien will move up in priority and become the new first mortgage lien on the title. Documenting this new priority arrangement will require the release of the mortgage securing the paid off loan.