What is the format used for multi-layer graphics that may also include alpha channels?

The PNG format is widely recognized for its ability to handle multi-layer graphics and support for alpha channels, which enables transparency in images. This characteristic allows shades of transparency, making PNG an ideal choice for web graphics, logos, and other images where layering and fine details are essential. In addition to its transparency capabilities, the PNG format uses lossless compression, preserving the quality of the image upon saving and re-opening, which is particularly beneficial for images requiring high fidelity and intricate details.

While other formats like TIFF can also support layers and alpha channels, PNG is more commonly used for web applications due to its smaller file size and compression capabilities. GIF is limited in terms of color depth and does not support more complex graphics or variable transparency levels. BMP, on the other hand, is a raw image format that does not support layers or alpha channels and tends to result in larger file sizes without the benefits of compression. Thus, when considering multi-layer graphics with transparency, PNG stands out as the preferred format.