What is Model View Controller ? MVC framework

What is a Controller ?

Controller is the place where all the database interactions are done. Any calculations, functions, or functionality is written the controller.

We studied that Models are used to fetch and insert data, Is that the same function of the controller? 

The answer is No. Model will have the database structure and in the controller we use the model to retrieve and insert data from and to the database.

Now let's discuss with an example

Most of the frameworks run on the same web address i.e. localhost:8000

So basically, when you search for a url like localhost:8000/products , In the file where you write your routes(file names are different for different frameworks like routes.php for Codeigniter, web.php for Laravel, etc) the control goes and searches for the route "/products" and then the control will go to the controller's function corresponding to that route. 

For Example:

route::get('/products','ProductController@index');

In the above example, the control will go to the controller named ProductController and go to the function named index().

Now inside the ProductController's index()

public function index()
{
return view('home');
}