is it possible for you to explain some details about how lossless can preserve all the information while reducing the storage? Like is it a transformation merely between storage type, like from polygon soup/adjaceny list/indices matrix->sparse matrix?

Does lossless compression hurt things like human-readability or time to convert from the compressed representation into other representations?

Does lossless compression try to change the structure of the data, or does it try to use a shorter bitwise representation?

How is this similar to downsampling?