What does "client" mean? - Memcached configuration [on hold]

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http://serverfault.com – This is my first question in ServerFault, and I really feel it is a beginner question. But believe me, I am really a beginner and I did my best to understand what does the world "client" mean for the caching notion. https://code.google.com/p/memcached/wiki/NewConfiguringClient What I know it that a client is a device that is receiving the result of execution of server side code (Browser for example). What does client configuration means if the Memecached operates in the RAM of the server? Any downvotes are highly appreciated if joined with some links that can help a beginner understand arch (HowTos)