Why solar energy is called an inexhaustible resource?

Inexhaustible resource -

It is the resource which never get reduced or deplete on constant usage, they are mainly the type of naturally occurring resources, hence they reappear in nature again.

The example of inexhaustible resources are - the wind energy, tides, solar energy and the geothermal energy.

Hence, the solar energy is also a form of inexhaustible resource.