How are changes made to the U.S. Constitution?

What does this answer mean?

The Constitution is changed through amendments. An amendment is a formal change or addition, and the rules for making one are in Article V.

The process has two steps. First, an amendment is proposed, usually by a two-thirds vote in both the House and the Senate. Article V also allows a national convention if two-thirds of the state legislatures ask for one, but that route has never been used: all 27 amendments were proposed by Congress. Second, the amendment must be ratified, or approved, by three-fourths of the states.

Those high bars make the Constitution hard to change quickly, so a change needs wide support across the country. The Constitution has 27 amendments since it was signed in 1787. The first ten were ratified together in 1791 as the Bill of Rights, and the most recent, about pay for members of Congress, was ratified in 1992.

Either answer works at the interview: "amendments" or "the amendment process." The word amendment comes up in several other questions, so it's worth knowing well.