LLC Limited Liability Company
It is a state created corporate entity. It has its own birth certificate ( an LLC certificate ) and its own Social Security Number ( a Federal Tax ID EIN ). Thus, it is a separate person. A legal person as opposed to a natural person because it has papers but no physical body. It is separate from you so you are not liable for its wrongs and taxes. As an LLC owner, you are called an LLC member who might also manage the LLC or another designated person could manage it. If you are going to make any serious money such as more than $50,000 per year, you may want to form an LLC or coproration. It is the best to help you save on taxes and protect you from personal liability.
If you file as a sole proprietor, you will be liable for all business debts and liabilities. For example, you have a cleaning business and your employee steals from your clients, you will be liable personally. If you form an LLC, and the same thing happens, your personal assets, such as your home and car are protected. If sued, they can only get what the LLC has. If only $1,000 in the bank, that is all the plaintiff gets.
Even though they will tell you that Delaware or Nevada is the best state, the best state is actually the state you do business in. This simplifies the entire business.