dotLottie is an open-source file format that aggregates one or more Lottie files and their associated resources (images, fonts, etc) into a single file to enable efficient and easy distribution of an animation.
dotLottie files are ZIP archives compressed with the Deflate compression method and carry the file extension of “.lottie”. Think of it as a superset of Lottie.
Check out this blog article to learn more: Introducing dotLottie
For more details, check out the dotLottie full documentation