What is Loaders?

In software development, particularly in web development and mobile app development, 'loaders' typically refer to components or mechanisms that manage the process of loading data or resources into an application. This can involve fetching data from a server, reading files from disk, or pre-processing data before it's displayed or used by the application. Loaders often handle asynchronous operations, progress updates, and error handling to provide a smooth user experience during data loading. They are used to prevent blocking the main thread and freezing the application during lengthy operations. Specific examples include data loaders in GraphQL, image loaders for efficient image display, and module loaders in JavaScript.