The tutorial introduces the development of a feature-rich chat application using AngularJS and PubNub, highlighting PubNub's pub/sub technology for real-time messaging. This first part of a six-part series focuses on sending and receiving messages, utilizing the PubNub AngularJS SDK to integrate PubNub's capabilities into web applications. It guides users through setting up a simple chat room, including installing the SDK using npm, Bower, or the PubNub CDN, and explains how to send and display messages by implementing a sendMessage() function and subscribing to message channels. The tutorial promises further enhancements in subsequent parts, such as message persistence, user lists, typing indicators, authentication, and channel management, all aimed at building a comprehensive AngularJS chat application.