Dijkstra's algorithm is a method used in computer science to find the shortest path between two points in a graph. A graph consists of nodes (or vertices) connected by edges, which can represent various things like cities and roads. The algorithm starts at a chosen node and explores all possible paths, keeping track of the shortest distance to each node until it reaches the destination. This algorithm is particularly useful in navigation systems, such as GPS devices, where it helps determine the quickest route to a location. By efficiently calculating the shortest paths, Dijkstra's algorithm ensures that users can save time and resources while traveling.