title: what is environment variable configuration in ssis and what registry entry configuration in ssis
body: <p>I am learning SSIS. Now I'm stuck with configurations. I have done xml, parent package and SQL configuration but I am not understanding what is Environment Variable configuration and what is registry entry configuration in SSIS.</p>
  
  <p><a href="https://i.stack.imgur.com/ZHUCN.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ZHUCN.jpg" alt="enter image description here"></a></p>