Benefits of front-end vs. direct serving

[Mihir Joshi]

What are the benefits of running Nginx as a front-end for Apache vs.
running PHP, Django, etc via FastCGI directly with Nginx?

Especially in terms of a VPS limited to 256MB - 512MB of RAM.

Sorry if this a very basic question that's probably been asked before, I
did try searching but couldn't find enough to go on.
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