Which file format is commonly used for web graphics?

The PNG file format is commonly used for web graphics due to its ability to support transparency and lossless compression. This means that PNG files retain their quality no matter how many times they are saved or edited, making them ideal for web use where image clarity is crucial. The transparency feature allows for the creation of images with varying levels of opacity, which is particularly valued in web design for creating overlays, logos, and other graphics that need to blend seamlessly with different backgrounds.

In contrast, formats like TIFF are typically used for high-quality images in print and not for web use due to their larger file sizes and the lack of support for transparency in many instances. RAW formats are used primarily by photographers for high-quality images that require extensive editing and are not suitable for web use as they are much larger and lack standardized display capabilities. PDFs, while versatile for documents, do not perform as efficiently for web graphics as PNGs, which are specifically optimized for screen display.