Depth-First Search (DFS) is a popular algorithm used to explore and traverse data structures like trees and graphs. It starts at a selected node and explores as far as possible along each branch before backtracking. This means it goes deep into one path until it can’t go any further, then it retraces its steps to explore other paths. DFS can be implemented using a stack, either through recursion or by using an explicit stack data structure. It’s particularly useful for solving problems like finding connected components or solving puzzles, where exploring all possibilities is essential.