Mana

Mana is a form of energy that exists in Mushoku Tensei. It is the source of all magic and is comparable to energy in our world. All living beings (human or non human) have mana except for people who "slipped" into the world (like Nanahoshi).

Magic
Magic one of the uses of mana. It is the usage of mana for a variety of purposes and elements; mostly attack and healing, but can also be for utility as well if the mage is skilled enough to use it in a versatile way.