An image with an opaque background that looks like it "floats" on the background of a Web page. To create an image with a transparent background, you need a tool to convert the image to GIF 89a format. Then you can select one color of the GIF image (e.g., the background if it is one color) and define it as transparent.
Images that contain transparency information. Currently, this is restrictive to GIF images where only one color can serve as the transparency color.
an image that allows part of the background surface to be visible
an image that allows the background to be seen through part of the image, as if part of the bitmap were transparent
an image, which you can see through
a normal, rectangular image with a color acting as a mask, letting the underlying color show through
An image that has had one color (usually the dominant background color) designated as `transparent', so that when the image is displayed in a browser, the image's background is colored with the browser's background color. The desired effect is an image that does not have a rectangular boundary.