Sole proprietorships are owned and controlled by a single individual who is entitled to all profits and responsible for all losses. They are easy to set up but have limited access to capital and unlimited liability.
Partnerships allow multiple individuals to pool resources and share profits and losses. However, each partner has unlimited liability and decisions can be made without consulting others.
Corporations are legally distinct entities with shareholders having limited liability. They are managed by a board of directors elected by shareholders. Corporations can access greater capital but are subject to more regulations and higher taxes.