The article introduces Conflict-free Replicated Data Types (CRDTs), a type of data structure that allows for collaborative editing without a central server. It explains the basics of CRDTs, including state-based and operation-based CRDTs, and provides examples of how they can be used to build collaborative applications. The article also discusses the Last Write Wins Register and Map, two simple CRDTs that can be combined to create more complex data structures. The goal of the article is to provide an interactive introduction to CRDTs and demonstrate their potential for building rich collaborative apps.