Element of Art
Texture is the feel, appearance, or consistency of a surface or a substance.
This picture shows the texture of the ball. You can see where the artist drew the rough areas on the ball and both shadows which shows where light is hitting.
This photo artist showed the texture of the thumb. You can see the detailed lines of the thumb to make it appear as if it is zoomed in.
This artist showed a lot of texture on this picture. They drew the detailed fur of the animal and you can see the shadows on the fur which shows where the light is hitting the animal. There's texture everywhere. Ears, fur, nose, face, body, even the background.