Bootstrap is a popular front-end framework that helps developers create responsive and visually appealing websites quickly. It provides a collection of pre-designed components, such as buttons, forms, and navigation bars, which can be easily customized. This means that even those with limited coding experience can build professional-looking sites without starting from scratch. One of the key features of Bootstrap is its grid system, which allows developers to arrange content in a flexible layout that adapts to different screen sizes. This ensures that websites look great on both desktop and mobile devices, making it an essential tool for modern web development.