Sole proprietorships are unincorporated businesses owned and run by one individual. They have some key advantages, including easy formation without much legal complexity, favorable tax treatment where business profits pass through to the owner's personal tax return, and full control and decision making power resting with the sole proprietor. However, sole proprietorships also involve unlimited personal liability for the owner, where they are personally responsible for all business debts and losses. They also have difficulties raising capital and lack continuity, being unable to survive the owner's departure.