TEXTURE

We can find a definition of texture in wikipedia:

Texture in painting is the look and feel of the canvas. It is based on the paint, and its application, or the addition of materials such as ribbon, metal, wood, lace, leather and sand.

The texture stimulates two different senses; sight and touch.

We are going to work with two types of texture: real texture and visual texture.

•  Real texture: this is a combination of how the painting looks, and how it feels to the touch. It is associated both with the heavy buildup of paint, such as an impasto effect, or the addition of materials.
•  Creating the visual effect of texture without actually adding texture. For instance, a texture created to look like something other than paint on a flat surface.

REAL TEXTURE 

In walls:

  

In floors:

In fabric to make clothes:

In instruments for cleaning:

VISUAL TEXTURE
When we use different tipes of lines we can get the feeling of texture: