The alpha channel is the channel used in computer graphics that contains transparency information. Without the alpha channel, an image is completely opaque. However, with the alpha channel, an image can have transparent areas that allow the background to show through.
The alpha channel is usually the last channel in an image file, and it is represented by a number between 0 and 1. A value of 0 means that the pixels are completely transparent, while a value of 1 means that the pixels are completely opaque.
The alpha channel is often used with logos and other types of graphics with transparent backgrounds.