Thunks is a lightweight JavaScript library for easily managing asynchronous operations within Redux applications. It allows you to write action creators that return functions (thunks) instead of plain actions. These thunks can then perform asynchronous logic, such as API calls, and dispatch regular actions upon completion. This simplifies handling side effects, improving Redux state management, and creating cleaner, more maintainable code. Thunks enable cleaner separation of concerns by moving asynchronous logic out from components.