An LLC is a hybrid business that marries some of the features of a corporation with some of the features of a sole proprietorship. Unlike a sole proprietorship, if you are registered with the government as an LLC, your business assets and liabilities are legally separated from your personal assets and liabilities.
http://smallbusiness.chron.com/can-llc-individual-sole-proprietor-10408.html
A Sole Proprietorship is one individual or married couple in business alone. Sole proprietorships are the most common form of business structure. This type of business is simple to form and operate, and may enjoy greater flexibility of management, fewer legal controls, and fewer taxes. However, the business owner is personally liable for all debts incurred by the business.
http://bls.dor.wa.gov/ownershipstructures.aspx
A limited liability company can be managed by managers or by its members. The management structure must be stated in the certificate of formation. Management structure is a determination that is made by the LLC and its members. The Secretary of State cannot give advice about management structure. Limited Partnership: A Texas limited partnership is a partnership formed by two or more persons and having one or more general partners and one or more limited partners.
http://www.sos.state.tx.us/corp/businessstructure.shtml
A limited liability company (LLC) cannot be a sole proprietor, but an individual can do business as an LLC. If you are a sole proprietor, you own and operate your own business, but it is not a corporation. A limited liability company is a business structure that is not a corporation and not a sole proprietorship. If you wish, you can register a business that you own and operate by yourself as a LLC, protecting you from business liabilities while still keeping the tax benefits of a sole proprietorship.
http://smallbusiness.chron.com/can-llc-individual-sole-proprietor-10408.html
Generally, businesses are created and operated in one of the following forms: Sole proprietorship: The most common and the simplest form of business is the sole proprietorship. In a sole proprietorship, a single individual engages in a business activity without necessity of formal organization.
http://www.sos.state.tx.us/corp/businessstructure.shtml
The owners of an LLC are called “members.” A member can be an individual, partnership, corporation, trust, and any other legal or commercial entity. Generally, the liability of the members is limited to their investment and they may enjoy the pass-through tax treatment afforded to partners in a partnership.
http://www.sos.state.tx.us/corp/businessstructure.shtml
Owners of an LLC are considered members, not shareholders. An LLC can have an unlimited number of members. If an LLC has more than one member, profits and losses of the company are divided based on their membership percentages.
http://smallbusiness.chron.com/can-llc-individual-sole-proprietor-10408.html
It costs nothing to establish a sole proprietorship. Unlike a sole proprietorship, an LLC is a hybrid of the partnership and corporate forms that allows the liability protection of a corporation with the tax advantages of a partnership. An LLC is a separate business entity that is owned by investors known as members.
http://bloomlawfirm.com/articles/31/limited-liability-corporation-versus-sole-proprietorship
If the LLC is structured properly, the income from the LLC is taxed directly to the members at their rates. One of the key benefits of an LLC versus the sole proprietorship is that a member's liability is limited to the amount of their investment in the LLC. Therefore, a member is not personally liable for the debts of the LLC. A sole proprietor would be liable for the debts incurred by the business.
http://bloomlawfirm.com/articles/31/limited-liability-corporation-versus-sole-proprietorship
However, the most common forms are the Limited Liability Corporation (LLC) and the Sole Proprietorship. While the Sole Proprietorship is the simplest and most popular form of business start up, it may not provide entrepreneurs with the legal and tax advantages that an LLC does.
http://bloomlawfirm.com/articles/31/limited-liability-corporation-versus-sole-proprietorship
is an llc a proprietorship
LLC is not a proprietorship. LLC is not a  proprietorship.