Turn-by-turn navigation is a feature found in many GPS devices and smartphone apps that provides step-by-step directions for reaching a destination. It guides users by announcing when to make turns, which roads to take, and how far to travel before the next instruction. This helps drivers and pedestrians navigate unfamiliar areas easily. The system typically uses a map interface to display the route visually, showing the current location and upcoming turns. Many turn-by-turn navigation services also offer real-time traffic updates, helping users avoid delays and find the quickest path to their destination.