US and Europe,Tipping...when and how much?

I will be visiting US and some countries of Europe(which countries?not yet decided) in couple of months and I am not familiar with the tipping culture there.

So i want to know where and how much should i tip.
I heard it is must to tip in US if you don't want dirty looks from the guy but not so in European countries,but i'm not sure.

and please i don't want to see people argue if tipping is right or wrong and why we must tip because waiters make very less.
just provide me with the tipping info in your country.
 

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