Ancient Egyptians practiced mummification to preserve the bodies of the dead, allowing the spirit to recognize and return to its body in the afterlife. The 70-day mummification process involved removing internal organs, using natron for drying, and wrapping the body with amulets and oils, culminating in a ritual to ensure the spirit's protection. Funerals included placing the mummy in a sarcophagus along with offerings for the afterlife, as well as rituals performed by priests to activate the deceased's senses.