Quick Sort is a highly efficient sorting algorithm that uses a divide-and-conquer approach to sort elements in an array. It works by selecting a 'pivot' element and partitioning the other elements into two sub-arrays, according to whether they are less than or greater than the pivot. This process is recursively applied to the sub-arrays until the entire array is sorted. One of the key advantages of Quick Sort is its average-case time complexity of O(n log n), making it faster than other sorting algorithms like Bubble Sort and Insertion Sort for large datasets. However, its performance can degrade to O(n²) in the worst case, particularly when the pivot selection is poor.