CacheFS is a filesystem caching technology developed for UNIX-like operating systems .It is designed to cache the contents of a remote filesystem onto the local disk to improve performance by reducing the number of network requests needed to access frequently used files. CacheFS works by intercepting requests to access remote files and serving them from the local disk cache, rather than accessing them over the network every time they are needed. CacheFS is used primarily in situations where network bandwidth is limited or where the latency of remote access is high, such as in WAN or satellite link scenarios. It is often used to speed up access to file servers, such as Network File System (NFS) servers. some of its features have been incorporated into other caching technologies, such as the Squid web proxy cache.