WhatsApp Web is a feature that allows users to send and receive WhatsApp messages on their computer. To use WhatsApp Web, users need to open the website on their computer and scan a QR code with their phone to link their account. There are also third-party apps available, such as Web Messenger for WhatsApp Web, that allow users to access the web version of WhatsApp and other messaging apps on their iPad or other devices. These apps may offer additional features such as desktop view, changing user agents, and managing browser storage.