what a different between road and street?

Really funny question... : ) Road : is a way used for traveling usually surfaced with concrete and designed to accommodate many vehicles travelling in both directions. Street : is a paved part of road, usually in a village or a town with houses and buildings on one and both sides.

"Road" is anything that connects two points, while ‘streets’ are public ways which have buildings on both side. 

road is anything that connects two points, while 'streets' are public ways which have buildings on either side.