Charm is to be well-received by a person.
Charisma is to be well-received by crowds at large.
If you're in sales (we all are, we are all presenting and selling the best version of ourselves -- no matter your job, relationship, or, business), this is for you. To be well-received by crowds, means the difference between waiting and GETTING your way.
This working will encourage people to warm upto you and hang onto your every word. Getting your way will be much simpler and commanding your way, will feel as simple as eating lunch.
Expect pleasantries and people to simply LOVE you. They will have far more respect and you will sound wonderful to others.