A street is a paved road with houses or buildings along the side. Cars, buses, bikes, and motorcycles travel in the street, while pedestrians use the sidewalk.
The street is what you drive a car on, but the word can also refer more generally to the neighborhood around the street, as in street theater or street fashion. And it can also mean a slightly dangerous, crime-filled environment: "It's rough out there on the street." In Old English, the word was stret, from the Late Latin phrase via strata or "paved road."