What is Laravel and why is it used?

Difficulty: Beginner

Interview Level: Junior → Senior

Interview Answer

Laravel is a PHP web application framework designed to make application development more structured, expressive and maintainable. It follows the MVC architectural pattern and provides built-in functionality for routing, controllers, database access through Eloquent ORM, migrations, validation, authentication, queues, caching, events, mail, notifications, testing and API development.

Laravel is built on top of PHP and uses Composer for dependency management. It also provides Artisan, a command-line interface that helps developers perform common development and maintenance tasks.

A major advantage of Laravel is that developers can concentrate on application/business logic instead of repeatedly implementing common infrastructure.

---

What problem does Laravel solve?

Suppose you build an application using plain PHP.

You might need to manually implement:

URL routing
Database connection
SQL abstraction
Input validation
Authentication
Authorization
CSRF protection
Password hashing
Email
File uploads
Sessions
Caching
Queues
Error handling
Testing
CLI commands

Laravel provides standardized solutions for many of these problems.

A typical Laravel request might look like:

Browser
   ↓
HTTP Request
   ↓
public/index.php
   ↓
Laravel Application
   ↓
Middleware
   ↓
Route
   ↓
Controller
   ↓
Service
   ↓
Eloquent
   ↓
MySQL
   ↓
Response
   ↓
Browser

This separation makes large applications easier to maintain.

---

Laravel and PHP

Laravel does not replace PHP.

Laravel is a framework written primarily in PHP.

For example:

class UserService
{
    public function createUser(array $data)
    {
        return User::create($data);
    }
}

This is PHP code using Laravel functionality.

Therefore, becoming a strong Laravel developer requires understanding PHP fundamentals such as:

• Classes
• Objects
• Interfaces
• Traits
• Inheritance
• Polymorphism
• Exceptions
• Namespaces
• Closures
• Anonymous functions
• Dependency injection
• Type declarations
• Enums
• Attributes
• Composer
• PSR standards

---

Real-world example

Imagine you're building an e-commerce application.

A customer submits:

POST /orders

Laravel can process it through:

Route
 ↓
Middleware
 ↓
Controller
 ↓
Form Request
 ↓
Service
 ↓
Eloquent Models
 ↓
MySQL Transaction
 ↓
Event
 ↓
Queue
 ↓
Email Notification

For example:

Route::post('/orders', [OrderController::class, 'store']);

Controller:

public function store(StoreOrderRequest $request)
{
    $order = $this->orderService->create(
        $request->validated()
    );

    return response()->json([
        'message' => 'Order created',
        'order' => $order
    ]);
}

The controller doesn't need to contain every piece of business logic.

That separation becomes extremely important as the application grows.

---

Why companies use Laravel

Laravel provides an ecosystem around common web-development requirements.

For example:

Laravel
├── Routing
├── Middleware
├── Controllers
├── Blade
├── Eloquent
├── Migrations
├── Validation
├── Authentication
├── Authorization
├── Queues
├── Events
├── Notifications
├── Mail
├── Cache
├── Filesystem
├── Testing
└── API development

This standardized structure helps teams work consistently.

---

Interview Follow-Up

An interviewer may ask:

Q: Is Laravel an MVC framework?

Yes. Laravel supports the MVC architectural pattern.

Model
   ↕
Controller
   ↕
View

However, real production applications often introduce additional layers:

Request
 ↓
Controller
 ↓
Service
 ↓
Repository / Eloquent
 ↓
Database

The exact architecture depends on application complexity.