Sustained low approval can shape media coverage, donor behavior, and how lawmakers position themselves heading into an election year.
It's a poll number showing how many people think Congress, as a group, is doing a good job.
Sharp drops often follow shutdowns, debt-ceiling fights, or gridlock, putting pressure on party leaders to cut deals or change strategy.
Survey firms ask a random sample of adults whether they approve or disapprove of how Congress is handling its job, then report the percentages.
Results are compared across months and years to spot trends tied to legislation, scandals, or partisan standoffs.
Analysts often contrast congressional approval with presidential approval, which is typically higher and more stable.