An SVGZ file is a Scalable Vector Graphics (.SVG) file compressed with gzip compression. It contains graphics data in an XML format and supports graphical elements including transparency, gradients, animations, and filters.
The Animated Portable Network Graphics (APNG) file format is an extension to the Portable Network Graphics (PNG) specification. It allows for animated PNG files that work similarly to animated GIF files, while supporting 24-bit images and 8-bit transparency not available for GIFs. It also retains backward compatibility with non-animated PNG files.