Bootstrap is an open-source HTML, CSS, and JavaScript framework for developing responsive websites. It was created by Twitter and was designed to make it easier for developers to create web applications quickly and easily. It includes a library of components and tools that allow developers and designers to create webpages with a consistent look and feel.
Bootstrap was popular because it made it easy for developers to create responsive websites quickly, and it was also open-source, meaning anyone could use it for free. However, newer frameworks such as React and Angular are becoming more popular due to their power and the growth of JavaScript libraries like React and Vue.js.
If you’re looking to create a simple website quickly, Bootstrap may be a great choice. But for more complex web applications, it’s best to use a more powerful framework such as React or Angular. It’s important to do your research to make sure the framework you choose is the right fit for your project.