Web Application
A web application is any application that uses a web browser as a client. The application can be as simple as a message board or a guest sign-in book on a website, or as complex as a word processor or a spreadsheet.

Web Hosting
web hosting service is a type of Internet hosting service that allows individuals and organizations to make their website accessible via the World Wide Web.

Web Matrix
Web Matrix is the latest Microsoft technology for Web Development community. It helps you to develop and deploy your ASP.Net application and SQL database in a single click. If you’re using WebMatrix, make sure that your web hosting company offers you WebMatrix Compatible hosting.

Webmail is an email service that uses a web browser to allow viewing, sending, receiving, editing & deleting of email, just as you would with standard email clients such as Outlook or Eudora. Webmail is ideal for mobile users because it allows you to access your email from anywhere, anytime with any computer connected to the Internet.

Whois is a protocol used to find information about networks, domains and hosts. The whois records normally include data on the organizations and the contacts associated with these networks and domains.