There are different types of these emails but they usually tend to be delivered the same way, usually just a plain text email with no images or links.
Email will be sent pretending to be a person of certain nationality, dying or sick with some lethal disease, then they would offer control of a large charity fund and in return you can do whatever it is you want with your percentage of %of said charity fund.
The email would be sent to request your assistance in form of an international monetary transfer action and in return you might get a percentage by helping them transfer an amount from their country to you. However, to start they will require some of your information. This type of scam wants you to engage with the actor and send them money with the false promise of a larger payment coming to you. This is called “Advance fee fraud”.