HyperText Markup Language (HTML) is the basic scripting language used by web browsers to render pages on the world wide web. HyperText allows a user to click a link and be redirected to a new page referenced by that link.
Cascading Style Sheets is a style sheet language used for describing the presentation of a document written in a markup language such as HTML or XML. CSS is a cornerstone technology of the World Wide Web, alongside HTML and JavaScript.
JavaScript-an object-oriented computer programming language commonly used to create interactive effects within web browsers.
Just as buildings and houses have a street address, webpages also have unique addresses to help people locate them. On the Internet, these addresses are called URLs (Uniform Resource Locators).
HTTP (Hypertext Transfer Protocol) is the set of rules for transferring files -- such as text, images, sound, video and other multimedia files -- over the web. As soon as a user opens their web browser, they are indirectly using HTTP.