Companionship, I think. It's a lot to ask someone to be around for you all the time, so some people get animals to keep them from feeling lonely. Or if you live on a farm, sometimes you have pets to help you with tasks, like herding or keeping pests away.
I could help you with it. I've never really had a pet before — I think BB-8 would get jealous, and I was never in one place long enough. But, between the two of us, I bet we could keep a pet alive.
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sorry for the double post