A security agreement, in the law of the United States, is a contract that governs the relationship between the parties to a kind of financial transaction known as a secured transaction. In a secured transaction, the Grantor (typically a borrower but possibly a guarantor or surety) assigns, grants and pledges to the grantee (typically the lender) a security interest in personal property which is referred to as the collateral. Examples of typical collateral are shares of stock, livestock, and vehicles. A security agreement is not used to transfer any interest in real property (land/real estate), only personal property. The document used by lenders to obtain a lien on real property is a mortgage or deed of trust.