The tutorial outlines the process of building a real-time group chat application using Vue.js and PubNub, focusing on the implementation of the Publish/Subscribe (Pub/Sub) model and history storage for message retrieval. PubNub is utilized to handle the underlying infrastructure, allowing developers to focus on the app itself by using the PubNub Vue.js SDK for sending, receiving, and storing messages. The tutorial involves setting up a centralized store with Vuex for managing application state, using unique user identifiers (UUIDs), and ensuring messages are displayed in real-time and stored for later retrieval. It also addresses the setup of a basic UI with components such as ChatContainer, MessageInput, MessageBubble, and ChatLog to facilitate chat functionality. Additionally, it highlights the importance of the Storage & Playback feature for message persistence and discusses the limitations of using temporary UUIDs, proposing persistent UUIDs for production to maintain message continuity. The tutorial concludes by encouraging further development and integration of additional features to enhance chat applications.