Subrogation is the legal technique uner the common law by which one party, commonly an insurer (I-X) of another party (X), steps into X's shoes, so as to have the benefit of X's rights and remedies against a third party such as a defendant (D). Subrogation is similar in effect to assignment, but unlike assignment, subrogation can occur without any agreement between I-X and X to transfer X's rights. Subrogation most commonly arises in relation to policies of insurance, but the legal technique is of more general application. Using the designations above, I-X (the party seeking to enforce the rights of another) is called the subrogee. X (the party whose rights the subrogee is enforcing) is called the subrogor.