What is the difference Between HTML and CSS?

HTML is hyper text markup language and was intended to define the content of the web page like

<h1> headers </h1>

<p> paragraphs </p>

<tittle> tittle </tittle>

CSS is Cascading Style Sheet ,CSS defines how HTML elements are to be displayed and is used to control the style and layout of multiple Web pages all at once.

body {    color: blue;}h1 {    color: #00ff00;}

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 HTML Hyper Text Markup Language ( just mark up tags , and may used for styling too )

CSS Cascading Style Sheets ( styling the web page) , separate file for styling the page

if you want to use HTML with styling you will make a template for HTML with style tag at the head

if you want to use separate styling CSS , that will be easier change or modified without any difficulty

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html says how a webpage should look. css or cascading style sheets define the style for each element in the html code. 

for example. font, color, margin, font size, submit button etc

HTML stands for Hyper Text Markup Language. HTML is a markup language for describing web documents (web pages).

CSS stands for Cascading Style Sheet. CSS is used for styling of web pages.