Wintering

Wintering

So, I'm still very very new to gardening, and I apologize for this question! I have a roma tomato plant and it's getting cold and wet (Southeast) here. The other day I went to pull it apart (it's about 2 feet tall) and let it compost, but it seemed very... "intact." I was under the impression that I would have to get an entire new plant next season; is this not true? Are they "annuals?" If so, is there any way to salvage it and winter it? It's been outside since it started getting cold, and it usually gets around 30 degrees at night. Winter is our rainy season, so we've had some pretty nasty cold rain as well. Anyone want to give me the rundown? I appreciate it!!
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