A bump chart, also known as a rank chart or slope chart, is a visualization technique used to display the rank ordering of items across multiple time periods or categories. The primary purpose of a bump chart is to highlight changes in rank position over time or across different groups. It typically consists of lines representing each item's rank, with the vertical axis indicating the items and the horizontal axis representing the time periods or categories. Bump charts are useful for identifying trends, shifts in relative positions, and comparing the performance or status of different entities over time.