what is html in html code example

Example 1: what should i use for html

You can both use notepad(Pc), TextEdit(Mac) but thats not really good
so i would probably use atom, sublime text or visual studio code

Example 2: what is html

HYPER-TEXT MARKUP LANGUAGE
Is the standardised markup language (a subset of XML) that 
defines the layout of a webpage. 
HTML has no functional properties, other languages such as 
JavaScript must be used in order to manipulate the layout
and perform HTTP requests.
CSS (Cascading Style Sheets) is commonly used to style the
elements in the layout.