What does Lazy load mean?

Lazy load, or deferred loading, is a technique in which some elements of a web page are loaded only when they are actually needed, for example when the user approaches them while scrolling. It is most often used for images, videos or embedded content that is not visible immediately after opening the page. As a result, not all content has to load at once, which can shorten the initial load time and reduce the amount of data transferred. Lazy load is used mainly on content-heavy websites and e-shops. However, it must be set up correctly so that it does not prevent important content from being displayed to users or search engines.