Advertising is a form of marketing that uses paid messages to encourage audiences to take action regarding commercial offerings. Marketing is the process of communicating the value of a product or service to customers for the purpose of selling it. The key difference is that advertising involves paid, non-personal messages from an identified sponsor, while marketing involves a mix of business activities to connect buyers and sellers. The advertising and marketing industry in the UK employs over 15,000 businesses and 250,000 people, generating £2.6 billion for the economy.