Discussion on: What's the difference between libraries and frameworks?

Well, without going into the technicalities of this, a library is a set of functions and utilities we use to make common tasks simpler and to build on top of existing tools.
A framework, on the other hand, is more an opinionated group of tools that are created for a purpose and that gives you everything you need for the task.

That's why it's commonly talked about React being a "library" and Angular being a "framework".