Web pages are made with 2 markup languages: HTML, Hyper text markup language, defines the content of pages and CSS, Cascading style sheets, defines how the page looks. When you use the internet your web browser opens a file store on a server computer, connected by the Internet, reads the HTML and CSS code and displays pretty pages on your screen.
In lessons 1-10 of our level one HTML/CSS course you'll create your own Code Avengers profile as you learn the basics of HTML. A markup language just gives the browser instructions on how to make everything appear on screen. Each element, like headings or paragraphs, has a default setting but can then be customised with CSS.

HTML uses tags to format things. It adds spaces, creates paragraphs and headings.
If you did not add tags to your text , the text will just show as lines of words on the web page, even if it has spaces the code editor
Compare the two code blocks below:

Tags typically come in pairs; an opening start tag and a /closing end tag:
The start tag defines the start of an HTML element.
E.g. in <title>Code Avengers</title> the start tag is <title>
The end tag defines the end of an HTML element.
E.g. in <title>Code Avengers</title> the end tag is </title>

Self-closing tags have no closing tag - only an opening tag.

An element is just what we call a whole tag group (the start, the end and what ever is in between).

When you are writing in HTML and making your web page use tab to move text two spaces in.