How do you define routes?

const appRoutes: Routes = [
{ path: 'todo/:id',      component: TodoDetailComponent },
{
  path: 'todos',
  component: TodosListComponent,
  data: { title: 'Todos List' }
},
{ path: '',
  redirectTo: '/todos',
  pathMatch: 'full'
},
{ path: '**', component: PageNotFoundComponent }
];

@NgModule({
imports: [
  RouterModule.forRoot(
    appRoutes,
    { enableTracing: true } // <-- debugging purposes only
  )
  // other imports here
],
...
})
export class AppModule { }