Q:

Why Am I Able to Use user() method in laravel, without even defining it

I do have a UserController and User Model in my Laravel 5 source.
Also there is one AuthController is also Present (shipped prebuilt with laravel source).
I would like to query data from db in my blades making use of Eloquent Models.
However, Neither in my User Model (Eloquent ) nor in any of the controller, the user() method is defined. even then, I could use it in my blade by accessing it from Auth class. why?
For example, 
in my blade, {{ Auth::user()->fname }} works. it retrieve the data fnamefrom my users table and echo it.
What is the logic behind it, and can i emulate the same for other db tables such as tasks?

A:

Whenever you do it automatically or manually some like this
 if (Auth::attempt(['email' => $email, 'password' => $password])) 
{
}

The selected User's Data will be stored in the storage/framework/sessions
It will have data something like
a:4:{s:6:"_token";s:40:"PEKGoLhoXMl1rUDNNq2besE1iSTtSKylFFIhuoZu";s:9:"_previous";a:1:{s:3:"url";s:43:"http://localhost/Learnings/laravel5/laravel";}s:9:"_sf2_meta";a:3:{s:1:"u";i:1432617607;s:1:"c";i:1432617607;s:1:"l";s:1:"0";}s:5:"flash";a:2:{s:3:"old";a:0:{}s:3:"new";a:0:{}}}

The above sessions file doesn't have any data and it will have the data such as user's id, url, token  in json format. 
Then whenever you call the {{ Auth::user()->fname }} Laravel recognises that you're trying to fetch the logged in user's fname then laravel will fetch the file and get the user's primary key and refer it from the user's table from your database. and you can do it for all coloumns of the users table that you have.
You can learn more about it here

