What is Router-link directive in Angular 2?

Router-link directive: - Router-link directive is used to link a specific part of your applications.

Syntax:-

<router-link> </router-link>

Example as,

<ul class='nav navbar-nav'>
    <li [routerLinkActive]="['link-active']">
        <a [routerLink]="['/login']">
            <span class='glyphicon glyphicon-Login'></span> Login
        </a>
    </li>
    <li [routerLinkActive]="['link-active']">
        <a [routerLink]="['/registration']">
            <span class='glyphicon glyphicon-Register'></span> Register
        </a>
    </li>
    <li [routerLinkActive]="['link-active']">
        <a [routerLink]="['/Billing']">
            <span class='glyphicon glyphicon-Billing'></span> Billing
        </a>
    </li>
</ul>  

Angular2 - Routing Concepts

What is Routing in Angular 2?	What is Routes?
What is Router Imports?	What is RouterOutlet?
Is it possible to have a multiple router-outlet in the same template?	What is RouterLink?