These finishes most often referred to as urethanes or polyurethane's remain on the surface of the wood and form a protective coating. They are generally available in high-gloss, semi-gloss, satin and matte.
So, as you can see, the difference between Congress and Senate is quite simple. Congress is the legislative branch of the government. It has two parts; the Senate and the House of Representatives. So, the Senate is a part of the congress.
The United States Congress is the bicameral legislature of the federal government of the United States consisting of two chambers: the Senate and the House of Representatives. The Congress meets in the Capitol in Washington, D.C.