A more thorough explanation:

The Uniform Reciprocal Enforcement of Support Act (URESA) is a model statute that was created in 1950 to standardize the way in which interstate support matters were processed and how one jurisdiction's orders were given full faith and credit in another jurisdiction. It was amended in 1958 and 1960 but was eventually replaced in 1997 by the Uniform Interstate Family Support Act (UIFSA).

The Uniform Interstate Family Support Act (UIFSA) is a model statute that was established in 1992 to create a one-order system by which an alimony or child-support decree issued by one state can be enforced against a former spouse who resides in another state. This statute has been adopted in every state and is the basis of jurisdiction in child-support suits. The purpose of the Act is to make the pursuit of interstate child support and paternity more effective, consistent, and efficient by requiring all states to consistently recognize and enforce support orders issued in other states.

For example, if a parent who owes child support moves from one state to another, the UIFSA allows the custodial parent to enforce the child support order in the new state. This ensures that the child receives the support they need, regardless of where the parents live.

Before the enactment of the UIFSA, there was considerable disparity among the states in the way they handled interstate child-support proceedings, since each state had differing versions of the earlier uniform law, the URESA. The UIFSA was revised in 1996 to further improve the consistency and efficiency of interstate child support enforcement.