When we talk about algebra, we are talking about math stuff that involves adding, multiplying, and sometimes dividing (not always). A Hopf algebra is a type of algebra that has some special rules that make it different from other types of algebra.
Now, a quasitriangular Hopf algebra is a type of Hopf algebra that is even more special than a regular Hopf algebra. It has a special property called quasitriangularity. This means that we can take two of these special Hopf algebras and combine them in a particular way to get another quasitriangular Hopf algebra.
It's kind of like building blocks. You start with one block, then you add another block onto it, and you get a bigger block. You can keep adding blocks like this to make even bigger structures. Just like how you build something bigger out of smaller pieces, we can build new quasitriangular Hopf algebras by combining smaller ones in a special way.
People use quasitriangular Hopf algebras to study things like quantum mechanics and computing. Mathematicians also use these special algebras to solve problems that are tricky to figure out using regular algebra. It's like having a superpower that lets us solve problems that other people can't!