Article I of the United States Constitution establishes the legislative branch of the federal government, known as Congress. It is divided into two parts: the House of Representatives and the Senate. This article outlines the powers, responsibilities, and structure of Congress, including how members are elected and the terms they serve. The House of Representatives is composed of representatives based on state populations, while the Senate consists of two senators from each state. Article I also details the legislative process, including how laws are proposed, debated, and passed, ensuring a system of checks and balances within the government.