DFS, or Depth-First Search, is an algorithm used for traversing or searching through data structures like trees and graphs. It starts at a selected node and explores as far as possible along each branch before backtracking. This method is useful for finding a path or checking connectivity in a network. In DFS, nodes are typically visited using a stack data structure, either explicitly or through recursion. The algorithm can be implemented in various programming languages and is often used in applications like solving puzzles, pathfinding, and analyzing networks. Its efficiency depends on the structure of the data being searched.