Should we get a credit card?

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We are a young married couple and we are considering getting a credit card. The reason we want one is mostly for emergency expenses but also for thigs like Christmas. We have the ability to pay off almost anything we puchase within a few months. We dont really understand exactly how it works (Apr and interest rates and all that) so if you could shed a little light in the area that would be great!

Should we get a credit card?