CSS stands for Cascading Style Sheets. It is a stylesheet language used to control the appearance and layout of web pages created with HTML. CSS allows web developers to define colors, fonts, spacing, borders, backgrounds, animations, and the positioning of elements, making websites visually attractive and responsive across different devices.
The term \"Cascading\" refers to the way CSS applies styles according to a hierarchy or priority. When multiple style rules exist for the same element, the browser determines which rule takes precedence based on specificity, importance, and source order. This feature makes CSS flexible and efficient for managing the design of large websites.
CSS works alongside HTML but serves a different purpose. While HTML provides the structure and content of a webpage, CSS controls its presentation and design. Modern websites rely heavily on CSS frameworks such as Bootstrap and Tailwind CSS to create responsive layouts quickly. Therefore, the correct expansion of CSS is Cascading Style Sheets, making Option B the correct answer.