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JavaScript is a programming language used commonly with HTML, CSS and others.
When people want to share code. THey are able to share different versions of the code and gain visibility remotely or locally.
Fork is similar to copy the only difference is that fork has its own seperate repository and does to impact the main repository when doing your changes.
it creates an exact copy of your repostiory an keeps the repository cpnnected to the main repository.
A pull request is the latest changes to your code waiting for approval .