WebRTC (Web Real-time Communications) is an API that enables peer-to-peer video, audio, and data communication directly within web browsers without the need for additional plugins or frameworks. This tutorial demonstrates how to create a basic video chat application using WebRTC, requiring just about 20 lines of JavaScript code. The application allows users to enter a username and initiate calls between browsers. Testing the application locally might require setting up a simple server to circumvent Cross-Origin Resource Sharing (CORS) issues. The guide outlines the necessary HTML and JavaScript components, including the use of libraries such as jQuery and PubNub to facilitate WebRTC operations and signaling, which is critical for coordinating communication between users. Additionally, the tutorial discusses how to prepare the application to receive calls and the importance of obtaining publish and subscribe keys from PubNub. Users are encouraged to further enhance their application by adding features like call management, thumbnail streams, and group chatting, and to consider browser compatibility when utilizing WebRTC.