IndexedDB is a low-level API for client-side storage of significant amounts of structured data, including files and blobs. It allows developers to create, read, update, and delete data in a way that is more powerful than traditional storage options like localStorage. This makes it suitable for applications that require offline capabilities or need to store large datasets. Data in IndexedDB is stored in the form of key-value pairs, and it supports complex queries and transactions. It is asynchronous, meaning it does not block the main thread, which helps maintain a smooth user experience. This technology is widely used in modern web applications.