Library
A library is a functionality grouped and packaged together. A library performs specific, well-defined operations. A library is just a collection of class definitions. The reason is it simply code reuse, in other words, gets the code that has already been written by other developers.
Framework
A framework on the other hand more complex. It defines a skeleton where the application defines its own features to fill out the skeleton.
Springboot/Rails are popular framework that deals with complexity of handling http request response cycle.
| Springboot | Rails |
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React on the other hand is a popular UI library not a framework.
When you call a method from a library, you are in control. But with a framework, the control is inverted: the framework calls you.
A framework can contain libraries. A framework will usually include many libraries to make your work easier.
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