Question

what is a bridge ? how is it useful

Answer 1

A bridge is a structure to cross an open space or gap. Bridges are mostly usefulfor crossing rivers, valleys, or roads by vehicles but people have also used bridgesfor a long time for walking. Bridges are structures built over railroad tracks, roads, rivers or some other obstacle.

Answer 2

bridge connects two separate things together no matter where it is. It is useful in many ways as it helps in shorting the space , effective etc
hope it helps