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 three branches of government are the legislative branch, the executive branch, and the judicial branch. The head of the federal legislative branch of government is Congress. The head of the state legislative branch of government is the state legislature. The Senate represents every state equally because each state has two senators.