A mortgage is a security interest in real property held by a lender as a security for a debt, usually a loan of money. A mortgage in itself is not a debt, it is the lender's security for a debt. It is a transfer of an interest in land (or the equivalent) from the owner to the mortgage lender, on the condition that this interest will be returned to the owner when the terms of the mortgage have been satisfied or performed. In other words, the mortgage is a security for the loan that the lender makes to the borrower. The word is a Law French term meaning "dead pledge," originally only referring to the Welsh mortgage (see below), but in the later Middle Ages was applied to all gages and reinterpreted by folk etymology to mean that the pledge ends (dies) either when the obligation is fulfilled or the property is taken through foreclosure. In most jurisdictions mortgages are strongly associated with loans secured on real estate rather than on other property (such as ships) and in some jurisdictions only land may be mortgaged. A mortgage is the standard method by which individuals and businesses can purchase real estate without the need to pay the full value immediately from their own resources. See mortgage loan for residential mortgage lending, and commercial mortgage for lending against commercial property. A mortgage is a security interest in realty created by a written instrument (traditionally a deed) that either conveys legal title or hypothecates title by way of a nonpossessory lien to a lender for the performance under the terms of a mortgage note. In slightly less than half of states, a mortgage creates a lien on the title to the mortgaged property. Foreclosure 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. Many mortgages contain a power of sale clause, also known as nonjudicial foreclosure clause, making them equivalent to a deed of trust. 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 this foreclosure does not require actions by the court, the transaction costs can be quite a bit less.