French drain
A basement French drain or perimeter drain creates a collection path for groundwater or seepage near the foundation edge.
Sump pump
A sump pump sits in a basin and moves collected water through a discharge line away from the basement.
Why they are often paired
A drainage system needs somewhere to send water. In many basement systems, the French drain feeds a sump basin, and the pump handles discharge. The right setup depends on the basement and site.