The priority queue is a special queue where the elements are inserted on the basis of their priority. This feature comes to be useful in the implementation of various other data structures. The following are some of the most popular applications of the priority queue: 1. Dijkstra’s Shortest Path algorithm: Priority queue can be used in Dijkstra’s Shortest Path algorithm when the graph is stored in the form of the adjacency list. 2. Prim’s Algorithm: Prim’s algorithm uses the priority queue to the values or keys of nodes and draws out the minimum of these values at every step. Data Compression: Huffman codes use the priority queue to compress the data. Operating Systems: The priority queue is highly useful for operating systems in various processes such as load balancing and interruption handling.