title: what is meant by Instance name?
body: <p>what is a <em>sql server instance</em> ? what does it mean and why do why need it ?</p>
  
  <p>I needed here :</p>
  
  <p><img src="https://i.stack.imgur.com/2nmQc.jpg" alt="enter image description here"></p>
  
  <p>What does an instance name mean ?</p>