Separation of concerns: CSS enables the separation of content from presentation, making it easier to manage and update the visual appearance of a website.

Consistent styling: CSS allows developers to apply consistent styles across multiple pages, ensuring a cohesive and professional look and feel.

Faster loading times: External CSS files can be cached by browsers, leading to faster loading times for subsequent page visits and improved performance.

Responsive design: CSS supports responsive design techniques, allowing web pages to adapt to different screen sizes and devices, providing a seamless user experience across desktop and mobile platforms.

Browser compatibility: CSS may render differently across different web browsers, leading to inconsistencies in layout and design.

Complexity: CSS can become complex, especially for large projects or when dealing with intricate layout requirements.

Performance overhead: Excessive use of CSS, especially with complex selectors or styles, can impact page load times and overall performance.

Specificity issues: CSS specificity rules can sometimes lead to conflicts or unintended styling overrides, requiring careful management and debugging.