title: Relationship between GIT, Bit bucket and source tree
body: <p>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</p>
  
  <p>My Confusion is: </p>
  
  <ol>
  <li>What is the particular use of source tree, bit bucket and GIT? </li>
  <li>How GIT is related to SurceTree and bit bucket?</li>
  <li>How GIT is related to Github?</li>
  </ol>