A suburb is a residential district located on the outskirts of a city. If you live in the suburbs, you probably travel to the city for work.
Suburb comes from Latin: sub means "below or near" and urbis means "city." You also will recognize this root in urban. Suburbs have more single-family homes than apartment buildings, and living there, you are more likely to have a yard with trees and grass. The downside is, if you work in the city, you might have a long commute that adds to the time you are away from your family.