title: What are the BOOT-INF and META-INF directories in a Spring-Boot JAR?
body: <p>When I open a jar package, there shows the <code>BOOT-INF</code> and <code>META-INF</code> folders, what's the function of them?</p>
  <p><a href="https://i.stack.imgur.com/e5JfH.png" rel="noreferrer"><img src="https://i.stack.imgur.com/e5JfH.png" alt="'s th" /></a></p>