Why do heavy websites keep their user content in other sub-domains?

I mean website’s like Facebook, Google, Gaana use sub-domains and also sometimes other domains to save their user data, like profile picture, songs, videos etc…

Why do they actually do that? I need to know the intention behind those things? Can’t they do that in the same domain in which their website is hosted?

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I think the over-simplified version of why: because it’s easier to point subdomains at different servers than it is paths.

But like a lot of things when you get to large scale systems, the real answer is probably much more complicated and much more specific to that entity and problem they are solving.


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