Lazy loading refers to a technique used in computer programming where resources, such as images or data, are only loaded when they are needed. This allows for faster initial loading times and reduces the amount of data that needs to be loaded at once, resulting in a smoother and more efficient user experience. Lazy loading is commonly used in web development to improve website performance and reduce bandwidth usage. It is also used in mobile applications to conserve battery life and improve overall performance. By delaying the loading of non-essential resources, lazy loading helps to optimize the use of system resources and enhance the overall functionality of a program or application.