Question

what is the advantage of having parallel and meridians

Answer 1

Meridians and parallels are imaginary lines running across the globe. They have been formulated to help locate places on Earth. In the absence of these imaginary lines, it would be near impossible to pinpoint regions.
it helps in loacting places on earth and it also hlps in navigating with car ,air plane etcc.. through out the world

Answer 2

The latitudes are also called parallels and the longitudes are also called meridians. They are imaginary lines. The advantage of having parallels and meridians is that, they help us to locate places.