Texture in digital art and design is an image that can be used on other 2D or 3D objects.
Seamless texture is an image that can be repeated without visible edges between them.
Here is a simple tutorial on how to make the image seamless: Seamless patterns with GIMP.
|Tiled texture is an image that is tiled in either X- or Y-direction.|
Alpha-masked texture is a PNG image without background (such background is also called transparent).
Images without background are useful in 2D and 3D graphics to make complex objects seem complex without using extra computing power.
Take a look at a simple 3DMax and Photoshop tutorial on how to use images without background to make complex 3D scenes.