CSS, or Cascading Style Sheets, is an essential style sheet language utilized by web developers to format HTML and other web elements. It plays a crucial role in web design, allowing developers to create visually appealing and structured websites. The tool emphasizes error-free markup, which is vital for effective styling. To aid in maintaining clean markup, CSS is often paired with utilities like HTML Tidy, which automatically corrects errors and enhances readability. Each style property is defined by its name, a colon, and its value, with semicolons used to separate multiple properties, ensuring clarity in styling instructions.

Cortex, a notable feature of CSS, streamlines the development process by integrating various tools, establishing clear protocols, and minimizing repetitive tasks. This enhances onboarding experiences and expedites code updates and issue resolution. CSS is widely adopted across various business sizes, from startups to enterprises, and supports a range of integrations with popular tools like Adobe Dreamweaver and Apache NetBeans. With documentation-based training and online support, CSS is accessible to a diverse user base.