Elections for the U.S. Congress are held every two years. Members of the House of Representatives serve two-year terms, while Senators serve six-year terms with staggered elections. This means that approximately one-third of the Senate is up for re-election every two years, coinciding with each House election. This frequent electoral cycle allows for regular accountability of elected officials and provides voters with the opportunity to express their preferences regularly. The biennial elections are crucial for shaping national policy and reflecting the public's changing priorities.