Intel-based mac vs PowerPC?

Okay. I was wanting to play the Sims 3 on my mac, which needed to be updated to snow leopard. I went out and bought the snow leopard disc and now my computer says it'll only install on an intel-based mac, while mine is a powerpc. I don't know anything about macs and I have no idea what this means. So...can I get an upgrade for the computer I already have or does that mean I'd have to have a completely different computer for all this to work? Have to say that I've always been a PC user and now I know why.

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