There are three main forms of business ownership: sole proprietorships, partnerships, and corporations. Sole proprietorships are owned by one person and have unlimited liability but are easy to start. Partnerships are owned by multiple people who share risks, rewards, and unlimited liability. Corporations are owned by shareholders, have limited liability, but more legal requirements. Other options include franchises, cooperatives, and nonprofits. Businesses can also be classified by their activities such as producers, processors, manufacturers, distributors, wholesalers, retailers, and service providers.