Loaders are animated visual elements designed to inform users that content is being fetched or processed. Also known as spinners or loading indicators, loaders are displayed during actions that may take some time, such as loading a webpage, submitting a form, or fetching data from a server.

They prevent user frustration by providing immediate feedback that the system is working and content is on its way. Loaders vary in design and can include rotating icons, progress bars, or animations that convey activity.

A well-designed loader contributes to a positive user experience by managing user expectations, reducing uncertainty, and ensuring users understand that their request is being processed.