HTML is the industry standard markup language for creating web pages. CSS, or Cascading Style Sheets, is a technique used for adding style to a web page. CSS is used to arrange the layout of a webpage, giving you control over aspects such as text color, font, spacing, text size, background pictures or colors, and much more. It styles HTML components rather than creating new ones. CSS may be embedded into HTML texts in three ways: inline, internal, and external, with external being the most commonly used method. With an external style sheet, you may change the whole appearance of the website by modifying only one file. CSS is used by front-end developers to design the layout of web pages, including changing the font, color, and size.