HTML (Hypertext Markup Language) and CSS (Cascading Style Sheets) are the fundamental technologies for building and styling websites. HTML provides the structure and content of a website, while CSS provides the visual styling and layout. Together, they enable web designers to create visually appealing and functional websites that users can access through a web browser. HTML & CSS are essential skills for anyone looking to enter the web design and development industry and offer many opportunities for career growth and advancement.