HTML standing for hyper text markup language is the standard markup language used to create web pages. It can be used on any browser on any device.
For example:

CSS meaning cascading style sheets is used for describing the look and formatting of a document written in HTML and defines how part of a webpage looks. Advantages are that it is simpler to read than HTML therefore is easier to work with.
Example:

JavaScript is a scripting language which means it is more basic than a programming language. It is dynamically typed and creates interactivity and dynamics to a website.
example:
