A library is a collection of code that is designed to help developers with common tasks. Libraries are typically designed to be used as plug-and-play components; developers can take the library, add it to their project, and use it with minimal effort. Libraries can also be extended and customized to fit the individual needs of a project.
A framework is a set of pre-defined components, libraries, and tools that are designed to help developers quickly create applications. Frameworks are typically more opinionated and require developers to conform to the conventions of the framework in order to build their applications. Frameworks also provide a lot of structure and guidance, which makes them great for larger projects and teams.
As mentioned above, React can be used as both a library and a framework, depending on the use case. For example, if you’re building a simple website that just needs a few components, you can use React as a library and include it in your project. On the other hand, if you’re building a larger application, you can use React as a framework and take advantage of its structure and conventions to quickly build your application.