What's the difference between "Why would you do that?" and "Why did you do that?"

[subhajit123]

What's the difference between "Why would you do that?" and "Why did you do that?"

​	What's the difference between Why would you do that? ​ and Why did you do that? ​ I always saw the sentence 'why would you do that' while watching movies. Why they prefer to use the word 'would'?

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[subhajit123]

Re: What's the difference between "Why would you do that?" and "Why did you do that

You appear to have copied and pasted this question from this site twice. Why did you do that?

I came across this question when I was surfing on the internet. I didn't find the answers there that could help me. So I asked the question here. I first time asked this question here.