A limited liability company (LLC) is a business structure where the owners (shareholders) are liable only to the amount they have invested. There are two main types of LLCs - private limited companies and public limited companies. Private limited companies have a minimum of one shareholder and do not have to trade shares on a public exchange or publish financial statements, while public limited companies have a minimum of two shareholders and must trade shares publicly and publish financial statements annually. To form an LLC, one must obtain name approval, prepare articles of association and sign shareholder documents, appoint directors and a secretary, submit required documents and pay fees, and obtain a company certificate and advertise the new company.