Babel is an open-source chat widget and API built with PubNub, designed for sending and receiving encrypted, self-destructing messages and exchanging 1024-bit RSA public keys in chatrooms. It is introduced in a five-part tutorial series aiming to guide users through building a self-destructing chat app, akin to Snapchat, but within a chatroom setting. The series covers various aspects, including setting up a key exchange system, sending TLS encrypted messages, and designing a chatroom UI. Users need to sign up for a PubNub account, obtain unique keys, and import necessary libraries such as the PubNub JavaScript SDK, babel.js, and cryptico.js to use Babel. The platform allows users to perform public key exchanges, send messages with a time-to-live (TTL) feature, and manage user presence with methods like onMessage and onPresence. Babel's functionalities are further explained through a working demo and detailed tutorials, which are available alongside the source code on GitHub.