It is very difficult to create these textures by hand, so they are usually created by artists who use computer programs. The process of creating the texture can be long and tedious, but with newer techniques, it has become easier.
A new and popular way of adding realism to textures is called the PBR (Physically Based Rendering). The use of this technique can make a texture look more like the real world and is thus more attractive.
To create a realistic Environment, Ground PBR Textures are necessary. This type of texture allows 3D Artists to better replicate lights or shadows on an object's surface.