After a measure passes in the House, it goes to the Senate for consideration. A bill must pass both bodies in the same form before it can be presented to the President for signature into law.
If the Senate changes the language of the measure, it must return to the House for concurrence or additional changes. This back-and-forth negotiation may occur on the House floor, with the House accepting or rejecting Senate amendments or complete Senate text. Often a conference committee will be appointed with both House and Senate members. This group will resolve the differences in committee and report the identical measure back to both bodies for a vote. Conference committees also issue reports outlining the final version of the bill.