What is an "CSS grid" in web design?

A CSS grid is a powerful layout system that allows web designers to create complex layouts using a grid-based approach, which consists of rows and columns. This method provides a flexible way to arrange elements on a webpage, making it easier to align and distribute space among them. With CSS grid, designers can define grid containers and specify the size and position of their child elements, enabling responsive design that adjusts seamlessly to different screen sizes.

By utilizing a grid, developers can minimize the need for floats and positioning hacks that were commonly used before its introduction. The ability to create both fixed and fluid layouts enhances the overall design process, allowing for a more structured and modular approach to webpage construction. This versatility is especially beneficial in modern web design, where user experience and accessibility are key considerations.