CSS utility classes offer a powerful way to streamline and organize web development by providing a library of predefined, self-descriptive styles that can be reused across projects. These classes, which form the backbone of utility-first CSS frameworks like Tailwind CSS, allow developers to build components efficiently without writing new CSS for each element. The approach promotes consistency and predictability, akin to design systems used in UI design, by centralizing style management and reducing CSS redundancy. However, it does come with challenges such as managing long class lists and large file sizes, which can be mitigated by tools like PurgeCSS. Developers can also build custom utility frameworks using SCSS to generate only necessary styles, thus optimizing CSS for specific project needs. As utility classes continue to gain traction, they reshape how developers approach styling, driving both ease of use and efficiency in modern web development.