I can try: Bootstrap is a component library with some utility classes on the side, whereas tailwind is a pure utility library with no components.
With Bootstrap, you get a set of predefined components you can use right away (buttons, modals, cards etc.). Tailwind on the other hand doesn’t have any components, but it makes it relatively easy to build them by offering utility classes, which allow you to style your HTML without having to write almost any CSS at all.
Bootstrap does have some utility classes, but it doesn’t embrace the concept as much as tailwind.
I came to tailwind from bootstrap and I wasn’t very happy initially because, even though I really liked the idea of styling everything using classes, I was missing a set of predefined components I could just use. I don’t like having to style my own buttons, modals and so on.
Luckily, if you want to use off-the-shelf components, there are excellent component libraries based on Tailwind. The best one IMO is daisyui 
