An end moraine is a ridge of debris (till) deposited at the edge or terminus of a glacier. It forms when the glacier is stationary for a period, allowing the accumulation of sediments carried by the glacier. End moraines are key indicators of the past extent and dynamics of glaciers, and they provide valuable information about glacial advance and retreat cycles.
Reference: Benn, D. I., & Evans, D. J. A. (2010). “Glaciers and Glaciation.” Routledge.