What file extension is commonly used for images that support both transparency and animation?

The file extension that is commonly used for images that support both transparency and animation is .gif. GIF (Graphics Interchange Format) is particularly well-known for its ability to create short, looping animations by combining multiple frames into a single file. Additionally, GIFs support transparency, allowing parts of the image to be clear so that the background can show through. This makes them ideal for web graphics that require simple animations and transparent backgrounds, such as logos or banners.

The other file formats listed do not have the same capabilities. PNG files support transparency and are often used for high-quality images, but they do not natively support animation. JPG files are widely used for photographs and do not support transparency at all. BMP files are uncompressed and do not support either transparency or animation, making them less suitable for web use compared to GIFs.