What is the difference between a senator and a representative?

The U.S. Congress consists of the Senate and the House of Representatives. Both senators and representatives are responsible for representing the people of the states they serve. This involves voting on and writing bills in the U.S. Congress. There are, however, some major differences between a U.S. senator and a representative. While both senators and representatives are permitted to introduce bills, senators are restricted from introducing bills that raise revenue, such as tax bills. There are 100 senators in Congress; two senators are allotted for each state. This number is independent of each state's population. However, the number of U.S. representatives a state has is determined by the population of that particular state. There are 435 representatives in Congress and each state has at least one representative. Another difference involves the length of time a senator and a representative are permitted to serve. A senator represents his or her state for a six-year term. A representative, on the other hand, serves for a two-year term.