PouchDB is an open-source JavaScript database designed for web applications. It allows developers to store data locally in the browser, enabling offline access and synchronization with remote databases like CouchDB. This makes it ideal for applications that require reliable data storage even when internet connectivity is unstable. One of the key features of PouchDB is its ability to replicate data between local and remote databases seamlessly. This means that users can work offline, and any changes made will automatically sync when they reconnect to the internet. PouchDB supports various platforms, making it versatile for different development environments.