Considering the definition of a framework, bootstrap is considered one because it has its own rules and guidelines which developers have to follow to make the best of it. I would say that Tailwind is even more of a library because of its flexibility but Bootstrap is more constrained in terms of its use and that's exactly what a framework does. But in the end, they are both still frameworks and the major difference between them is their design philosophy; one uses a utility-first approach while the other uses a component-based approach. Thanks for stopping by 😊