What exactly causes BSOD?

I know that may be an impossible question to answer "exactly", but I'm more curious about what are the typical causes of the infamous BSOD? The reason I ask: My current custom build, which is an upgrade from a previous custom build, gets the blue screen every once in a great while....hardly enough to really annoy me or cause problems with my work, just not a problem...However if the possibility to resolve the issue permanently, or even get a better understanding of their triggers would be worth to pursue at least.

Thanks!
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More about what bsod
  1. Write down the stop code, google it and you will know the exact cause of YOUR bsod.
  2. It can be software or hardware. Most commonly it is a bad driver or driver compatibility issues. Second most common is bad memory. From there it gets difficult to track down the exact cause.

    Checking recent minidumps with a program like bluescreenview can be useful.
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