Digital marketing is the marketing of products or services using digital technologies, mainly on the Internet, but also including mobile phones, display advertising, and any other digital medium

Web development is the work involved in developing a web site for the Internet or an intranet. Web development can range from developing a simple single static page of plain text to complex web-based internet applications, electronic businesses, and social network services

An Internet booking engine (IBE) is a website that allows consumers and travel agents to book flights, hotels, holiday packages, insurance and other services online.