display both sides

hi… How do i make both the sides visible of a plane in unity… is there any option like display both sides

You can’t, you need two different planes for that, or a very thin box, alternatively.

The reason is that graphics systems always cull backfaces. The faces are usually determined by the winding order, i.e. the order in which the vertices of a triangle are declared. Backfaces are culled because it’s an easy way to conserve computational power - it is usually not necessary to render a face that’s turning away from the viewer, such as the other side of an object’s mesh, for instance.