1. A proxy server is an intermediate device between a client and a server to process transactions between them without exposing each other.
The broker accepts and forwards connection requests, and then returns data for these requests. This is the basic definition, because there are dozens of unique proxy types, so it is very limited to having its own unique configuration. Agents make up our website, online services and other networks. People use proxies for a lot of things: most can change your IP address, while others can protect large websites or just authenticate public Wi-Fi users.
2. A cache server is almost always also a proxy server, a server that "represents" users by intercepting their Internet requests and managing them for them.
A cache server is a dedicated web server or service that acts as a server to store web pages or other Internet content locally. By placing previously requested information in temporary storage or cache, the cache server can both speed up access to the data and reduce the need for enterprise bandwidth.
A cache server is a subtype of proxy server that stores its content retrieved from the WAN locally so that it can be used by other computers without having to access the WAN.
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