CREDIT CARDS! is it wise to get one when you 're an impulsive buyer?

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anyone here? i need your view on this... there are alot of banks who offer credit cards and so claims to have a a very low interest rate or they go into gimmiks and promos just to get you to sign up forms and even a promise you a fast processing of applications! whew! and they're almost everywhere! although i know some people who got into major trouble because of these credit cards it's still amazing that a lot of people still wants it...and even the bank companies themselves won't stop enticing people to fall into this trap. i guess it's useful for emergencies...but what are really these cards for? do we need it, as in need to have it? if this is not for everybody then whose it for? how many of these must one have? if you don't have one (like me) should you consider having one? if you have 1, 2 or even 3 would you encourage others to get one? COMMENTS ANYONE??