25th amendment does what?

The Twenty-fifth Amendment (Amendment XXV) to the United States Constitution deals with issues related to presidential succession and disability. It clarifies that the vice president becomes president (as opposed to acting president) if the president dies, resigns, or is removed from office; and establishes procedures for filling a vacancy in the office of the vice president and for responding to presidential disabilities. The Twenty-fifth Amendment was submitted to the states on July 6, 1965, by the 89th Congress and was adopted on February 10, 1967.

The 25th amendment means that if the president gets sick and is unable to serve for a short period of time, the vice president becomes the president until the president is better.