Set theory is a branch of Algebra which deals with the Elements of Sets and the concepts that comes along with. This is not only exist in Algebra, but also in various aspects in order to explain the stuff.
The notations or the systems or say hierarchy in it is quite easy and simple to understand.
Set theory takes a base of the Sets and it’s terms such as – Subsets, power set, closed & Open sets, etc.. In other words, we can say that this branch of Algebra can explain any kind of data sequentially . As it has the proper hierarchy for this.