In the United States government, the Senate is one of two congressional houses. The main job of the Senate, along with the House of Representatives, is to make laws.
When you see the capital S in Senate, you know it refers to the group of lawmakers — called senators — who work to get legislation passed in the US. The Senate also votes on presidential appointments and proposed treaties, unlike the House of Representatives. Every state elects two senators to serve six-year terms in the Senate. The Latin root of Senate is senatus, "council of elders," from senex, or "old."