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A CBZ file is literally a ZIP file renamed. Inside: a sequence of images (JPG or PNG), numbered or named in reading order, that a comic reader displays one page at a time. No metadata format, no markup language, no rendering engine — just images in a ZIP. The simplicity is the point.
The format became the standard for digital comics because it's dead simple to create (zip your images, rename to .cbz) and dead simple to read (unzip and look at the images, or use a comic reader for a better experience). Comic readers add page-turn animations, dual-page spreads, zoom, bookmarks, and library management on top of the basic format.
Calibre, YACReader, CDisplayEx (Windows), and Panels (iOS) are the popular comic readers. On any platform, you can also just rename .cbz to .zip and extract the images. For archiving large comic collections, CBZ is preferred over CBR because ZIP compression is faster and the archives are easier to work with.