Making laws
congressional district
The geographic area a single U.S. Representative is elected from. There are 435, redrawn after each census so they hold nearly equal populations.
In full
Every state gets at least one seat, and the rest are apportioned by population. States with more than one seat divide into districts of roughly equal population, redrawn after each decennial census. Several states currently have a single at-large district. District lines determine which candidates you can vote for, and they are the object of both redistricting law and gerrymandering fights.
Also written as: congressional districts
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.