Styling languages are specialized coding languages used to control the appearance of web content. The most common styling language is CSS, which stands for Cascading Style Sheets. It allows developers to change colors, fonts, layouts, and other visual aspects of a website, making it more appealing and user-friendly. Another important styling language is Sass, which extends CSS by adding features like variables and nested rules. This makes it easier for developers to write and maintain complex styles. Overall, styling languages play a crucial role in web design, helping to create visually engaging and organized online experiences.