What are patterns and textures used for in Adobe Photoshop?

What are textures and patterns used for in adobe photoshop and any good websites with tutorials on enhancing your own pictures using patterns?





Thanks for this matter.What are patterns and textures used for in Adobe Photoshop?
Textures are to create textures, of course, on top of the image or as a background.





Patterns are one small pixel duplicated many times to create a layer of patterns that you specify on top of the image.





Here's a great site for textures:





http://mayang.com/textures/





And here's a good site for patterns:


http://www.brusheezy.com/patterns