A limited liability company (LLC) is a business structure that combines the benefits of corporation and partnership, protecting owners from personal liability.
A share certificate is the written document that shows you own part of a company, which is great until you lose it and have to explain to your cat why you can't afford their gourmet kibble anymore!
A shareholder is an individual or entity that holds shares in a company, bearing both the potential for profits and risks, while enjoying certain rights in the company.