BubbleSort is a simple sorting algorithm that repeatedly steps through the list, compares adjacent elements, and swaps them if they are in the wrong order. This process is repeated until the list is sorted. The algorithm gets its name from the way smaller elements 'bubble' to the top of the list. Although BubbleSort is easy to understand and implement, it is not the most efficient sorting algorithm for large datasets. Its average and worst-case time complexity is O(n²), making it less suitable for performance-critical applications compared to more advanced algorithms like QuickSort or MergeSort.