What happens when you run ng serve? : <p>I've been using <a href="https://github.com/angular/angular-cli">Angular-CLI</a> for the last little while. It comes with a number of commands including <code>ng serve</code> which spins up a server at <code>localhost:4200</code>.</p>

<p>I'm used to using Grunt and Gulp which can be configured to suit my needs. I wanted to configure Angular-CLI's server but then I realized I didn't know what it was or how to configure it. Grepping the project for <code>serve</code> hasn't unearthed anything that seems useful.</p>

<p>So, what exactly does <code>ng serve</code> do?</p>
