MLM means multi level marketing and these are business opportunities that most people are now staying away from because if they happen to work for you, then they are just a flash in the pan and a one time deal. They work on a pyramid bizopp where, for example, one person sends a dollar to people on a list and then mails it to those people, your name included. Then the next person does the same thing with your name included. If your name is included on five different mailings, then you would get the dollars from all of the people that mailed them out.