A sidewalk is a paved path for walking, often alongside a road. If your neighborhood has sidewalks, it's easier and safer to take a little jog.
While English speakers in other parts of the world might use words like footpath or pavement instead, North Americans typically use sidewalk. Most sidewalks are slightly higher than the street and are often separated from them by a curb or a strip of grass. There is some historical evidence that Ancient Greece had sidewalks, though the word itself dates from about 1740.