title: What is a Grails Plugin? What does it mean to Install a Plugin?
body: <p>I used Grails recently, and added Grails plugin for JQuery, but I don't think it did anything more than just copy some jQuery files over.</p>
  
  <p>So far, I have seen info only on 'how to install and use' plugins...but I can't find anything that describes the concept of a plugin.</p>
  
  <p>Can somebody please tell me, what is a Grails Plugin? And what does it mean to 'Install' a plugin?</p>