ngRoute

ngRoute is a module of AngularJS (1.x) that provides routing and deep-linking capabilities for single-page applications. It enables navigation between different views by mapping URLs to templates and controllers without reloading the page. The module introduces the $route service, which exposes the current route, and the $routeProvider, which is used during configuration to declare routes.

Key features include the ngView directive, which serves as the placeholder for the active template; route definitions via $routeProvider.when(path, route) and a final otherwise(...) for redirects; support for template or templateUrl, controller, and a resolve property to fetch data before the view is displayed. Route parameters become available via $routeParams, and controllers can respond to route changes through route-related events and services.

Usage typically requires loading the angular-route.js script in addition to angular.js, and creating an app module that depends on ngRoute: angular.module('myApp', ['ngRoute']). Configuration examples use .when and .otherwise to map paths to templates and controllers, with options such as templateUrl, template, controller, and resolve.

The ngView directive renders the template for the current route, and route change events like $routeChangeStart and $routeChangeSuccess provide hooks for running code during navigation. The $route service also exposes current route information, and controllers can access route parameters via $routeParams.

Limitations include support for a single ngView per page and a lack of named or multiple simultaneous views, which are available in more feature-rich routers such as UI-Router. ngRoute is provided as a separate script, angular-route.js, and is used for straightforward routing needs in AngularJS 1.x; for more complex state-based routing, developers may opt for alternative solutions.