Step 1: Understand what DFS stands for - it means Depth-First Search, which is a method for exploring graphs.
Step 2: Know what a directed acyclic graph (DAG) is - it's a type of graph that has directed edges and no cycles (no way to return to the same node).
Step 3: Learn about topological sorting - it's a way to arrange the nodes of a DAG in a linear order such that for every directed edge from node A to node B, A comes before B in the order.
Step 4: Recognize that DFS can be used to perform this topological sorting by exploring each node and its connections deeply before moving to the next node.
