Answer 1

Html is markup language used to make webpages and html 5 is upgraded version of html with extra features and css is cascading style sheet which used to enhance your webpage, help your webpage to look better and css3 is upgraded version of css

Answer 2

//HTML is HTML5 and CSS is CSS3 just 5,3 means they are updated new versions

Answer 3

hello, HTML is used to create a body of your page, for example, creating a skeleton and CSS is used to add decent design to that page like providing cloths to that skeleton body.
HTML5 and Css3 is upgraded versions of HTML and Css