what are angular developers and where can i hire them?

Looking for application development solutions, I came across that it is much better and more recommendable to hire Angular developers. Is this true? because I have little information about what angular developers are and I am interested in knowing more about it, before hiring developers I want to be more informed which is the best option, what are angular developers and what are the differences with solution developers Of applications? I am also interested in knowing how to hire them if I decided on them