With the advances in processing, memory, and connectivity technologies, applications are becoming increasingly distributed, data-centric, and web based. These applications demand support for large number of users at high performance, requiring extreme scale, high availability, and low latency data access. Such applications are known as Extreme Transaction Processing (XTP) applications. Distributed Caching Platforms exploit the advances in the memory and networking technologies to fuse memory on multiple machines into a single unified global memory providing data access at low latencies. These Distributed Caching Platforms are evolving into in-memory data platforms for XTP applications. This tutorial provides a comprehensive overview of Distributed Caching Platform technologies and their usage.