How many U.S. senators are there?

What does this answer mean?

There are 100 U.S. senators: two for each of the 50 states. The Constitution gives every state two senators no matter how many people live there, so a small state like Wyoming has the same number as a large state like California.

That equal number came from a deal at the Constitutional Convention, often called the Great Compromise. Larger states wanted representation based on population, and smaller states wanted an equal vote. The answer was a Congress with two parts: the House of Representatives, where seats depend on population, and the Senate, where every state counts the same.

At first, state legislatures chose senators. The 17th Amendment, ratified in 1913, changed that, and since then the voters of each state elect their senators directly. Senators serve six-year terms.

Washington, D.C., and the U.S. territories, such as Puerto Rico and Guam, don't have senators, so all 100 seats belong to the 50 states.