Lazy loading is a web design technique that allows images and other media to be loaded on a web page only when they are needed, rather than loading everything at once. In WordPress, lazy loading is typically implemented using a plugin or script that adds the necessary functionality to your site.
The purpose of lazy loading is to improve the performance and speed of your WordPress site, by reducing the amount of data that needs to be loaded when a user visits your site. When lazy loading is implemented, images and other media that are below the fold or off-screen are not loaded until the user scrolls down to them, or until they are needed for some other reason.
Overall, lazy loading is a useful and effective technique for improving the performance and speed of your WordPress site, and can help to reduce load times, bandwidth usage, and server resources.
However, it is important to use it appropriately and sparingly, as overuse or misuse of lazy loading can cause issues with accessibility, SEO, and user experience.