What is a common file format for web graphics that supports transparency?

The correct answer is PNG because it supports the use of transparency in images, allowing for smoother blending of the image with web page backgrounds or other graphics. This ability is particularly valuable for web designers who want to create layered visual designs or use images that seamlessly integrate into various colored backgrounds.

In contrast, JPEG files do not support transparency; they are better suited for photographs and images where a solid background is acceptable. GIF files do offer limited transparency, but the range is restricted, only allowing for one color to be designated as transparent, which can sometimes result in harsher edges compared to PNG. BMP files do not support transparency and are generally not optimized for web use due to their larger file sizes and lack of compression, which makes them less efficient for online graphics.

Overall, the PNG format is favored for web graphics needing transparency because it maintains high quality and allows for complex visual effects, making it an ideal choice for modern web design tasks.