title: How two people, concurrently editing the same file is handled?
body: <p>I believe the title says it. I'm new to source control thingy.</p>
  
  <p>So, let's say I have two developers working on the same project and they started editing the same file(s) at the same time then everyone of them send the new version at a slightly different time. From what I understand the one who sends the changes last will have his changes kept, the other one's code will be in the archive only!!!</p>
  
  <p>Is that correct?</p>
  
  <p>Please clarify. Thanks.</p>