"Article I of the Constitution establishes the legislative or law making branch of government with the formation of a bicameral (having two branches, chambers, or houses: the Senate and the House of Representatives) Congress. This system provides checks and balances (each has the right to amend acts of the other) within the legislative branch."
The federal legislative branch of government includes:
Agencies that provide support services for the Congress: include the Government Publishing Office (GPO), the Library of Congress (LC), the Congressional Budget Office (CBO), the Government Accountability Office (GAO), and the Architect of the Capitol.
Databases for accessing legislative information:
How a Bill Becomes a Law (see more at How Our Laws are Made)
Committee Action. The bill comes under its most intense scrutiny while in committee, and many bills die in committee.
Floor Action. Next, the bill appears before the entire House or Senate. The two chambers have different procedures for floor debate.
Second Chamber. Once one chamber has voted to pass a bill, the other chamber may:
Conference. When the two chambers pass differing versions of legislation, the bill goes to conference – the "third chamber" of Congress.
The President. The Speaker of the House and the President of the Senate both sign the approved bill and send it to the president, who then has four options.