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Motivating the category of chain complexes

Chain complexes (of, say, abelian groups) are fundamental in homological algebra and algebraic geometry. For example, using the derived category of an abelian category is very natural nowadays. From another point of view, a lot of people are working on generalizing this ideas to the non abelian world (using simplicial stuff), see for example this answer.

So my question is: why chain complexes? I already know that they are extremely useful, but I'm looking for some theoretical reason for study them.

Ricky

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marked as duplicate by Martin Brandenburg, Ricky, Qiaochu Yuan, Zev Chonoles, GH from MO Jul 8 '11 at 21:20

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Duplicate: mathoverflow.net/questions/68339/… –  Martin Brandenburg Jul 8 '11 at 13:41
    
Sorry! I've checked before posting, by it seems I'm not able to use the searching tool! –  Ricky Jul 8 '11 at 13:54
    
Never mind. I remembered the former question and just typed "chain complexes" into the seach panel. –  Martin Brandenburg Jul 8 '11 at 14:08