HTML stands for HyperText Markup Language and is the standard markup language for creating websites. It is just text with special "commands" (tags) that tell the browser how to display a website on the internet.
Example HTML code:
<b>Bold text</b> will be displayed as Bold text (the b in the tag stands for "bold")
At nPage, when you create your website, our system will automatically generate the correct HTML code for your website. But you can also edit the HTML code of your page yourself in the editor by clicking on the "Source" button.