Ancient Egyptians developed the practice of mummification over time. Originally, naturally mummified bodies were preserved whole through burial in hot desert sands. However, placing bodies in coffins meant soft tissues rotted away, leaving only skeletons. So the Egyptians began artificially mummifying bodies before placing them in coffins through processes like removing organs, dehydrating the body, and wrapping it in linen bandages to fully preserve it for the afterlife. This artificial mummification process became prominent but was expensive, so most common Egyptians were still buried naturally in the desert sands.