In the UK, you can form several types of companies, including a Private Company Limited by Shares (Ltd), which is the most common for small and medium businesses; a Private Company Limited by Guarantee, often used by non-profits and charities; a Public Limited Company (PLC), suitable for larger businesses that want to offer shares to the public; a Limited Liability Partnership (LLP) for professional partnerships; and a Sole Trader structure for individuals running a business on their own.