Caching for Cash: Caching

This document discusses various caching options for websites to improve performance including flat file caching, RAM disk caching, Memcache caching, and APC caching. Memcache caching stores key-value pairs in memory for fast retrieval and is commonly used by large sites like Facebook and Wikipedia to cache dynamic content, database queries, and other computationally expensive processes. APC caching stores precompiled PHP opcode in shared memory for faster execution. Caching improves performance by reducing memory usage, processing time, disk access, and network traffic.