memcached and redis

Hello,

Another noob question. Please bear with me. I am really very confused between memcached and redis. I know they both are used for caching. But I don't know how much does they help. And lastly, I would like know what would you use for a site with users uploaded pictures and videos too? I hope I was clear. If not please ask. Your help and guidance will be very much appreciated.

Thank you.

Robin.

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