Yes, a single LLC can engage in multiple types of businesses and could have, for example, several DBAs, one for each type of business. There are pros and cons to doing this:PROs: save costs, less paperwork. More flexibility to move or deploy money from one business line to another, if necessary; more ability to take business losses in one line as a tax deduction, since you may have profits from another line of business to apply them against.CONs: Less liability protection: if you have, say, three businesses operating under one LLC, all three are potentially vulnerable to a lawsuit against, or liable to repay a debt owed by, one of the businesses, since they are all part of the same entity.