Rural means "relating to or characteristic of the country or the people who live there." If you move to a rural area, you won't see a lot of skyscrapers or taxis — but you'll probably see a lot of trees.
You may have known people who live on country roads––mail to their houses must be addressed to a rural route, abbreviated as RR. Rustic is a near synonym but emphasizes the supposed qualities of country people: being simple, awkward, and even rude and rough. The adjective rural descends from Middle English, from Old French, from Latin rūrālis, from rūs "the country."