Relationship between GIT, Bit bucket and source tree

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I am new to GIT, currently in my project they are using bitbucket and SourceTree. I am only using bit bucket for cloning project and source tree for taking that project on my local drive.When does GIT come into the picture

My Confusion is:

  1. What is the particular use of source tree, bit bucket and GIT?
  2. How GIT is related to SurceTree and bit bucket?
  3. How GIT is related to Github?
2 Answers
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