Elections & terms
term limits
Only the presidency is term-limited federally: two elected terms (Twenty-Second Amendment). Members of Congress can serve unlimited terms; states cannot change that.
In full
After Franklin Roosevelt's four elections, the Twenty-Second Amendment (1951) capped presidents at two elected terms (plus at most two years of an inherited term). No such limit exists for Congress: the Supreme Court held in U.S. Term Limits v. Thornton (1995) that states cannot add qualifications, including term limits, for their federal legislators; only a constitutional amendment could.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.