Django is a high-level web framework for building web applications that is written in Python. It follows the model-view-controller (MVC) architecture pattern and is designed to be fast, secure, and scalable. In this guide, we will explore the history of Django, how to write it with an example, and what are the best applications for it.

History
Django was created in 2003 by Adrian Holovaty and Simon Willison while working on a news website called Lawrence Journal-World. They found that building web applications was tedious and repetitive, so they decided to create a framework that would handle all the low-level details and allow developers to focus on the application logic. Django was released as open source software in 2005 and has since become one of the most popular web frameworks in the world.

Writing Django with an Example
To write Django, you'll need to have some familiarity with Python. If you're new to Python, you should first learn the basics of the language. Once you're comfortable with Python, you can start learning Django.

Let's start with a simple example. We'll create a Django project that displays a "Hello, World!" message on a web page.

First, create a new Django project using the following command:

```
$ django-admin startproject helloworld
```

This will create a new directory called "helloworld" with the following structure:

```
helloworld/
    manage.py
    helloworld/
        __init__.py
        settings.py
        urls.py
        asgi.py
        wsgi.py
```

Next, create a new Django app using the following command:

```
$ python manage.py startapp hello
```

This will create a new directory called "hello" with the following structure:

```
hello/
    __init__.py
    admin.py
    apps.py
    models.py
    tests.py
    views.py
    migrations/
        __init__.py
```

Open the "views.py" file in the "hello" app directory and add the following code:

```python
from django.http import HttpResponse

def hello(request):
    return HttpResponse("Hello, World!")
```

This code defines a view function called "hello" that returns an "HttpResponse" object with the message "Hello, World!".

Next, open the "urls.py" file in the "helloworld" directory and add the following code:

```python
from django.urls import path
from hello.views import hello

urlpatterns = [
    path('hello/', hello, name='hello'),
]
```

This code defines a URL pattern that maps the "/hello/" URL to the "hello" view function we defined earlier.

Finally, start the development server using the following command:

```
$ python manage.py runserver
```

Open your web browser and navigate to "http://localhost:8000/hello/". You should see the message "Hello, World!" displayed on the page.

Best Applications for Django
Django is a versatile web framework that can be used for a wide range of applications. Here are some of the best applications for Django:

1. Content Management Systems (CMS): Django includes a powerful admin interface that makes it easy to create and manage content. Many popular CMS, such as Mezzanine and Wagtail, are built on top of Django.

2. Social Networks: Django's built-in authentication system and user management make it easy to create social networks and online communities.

3. E-commerce: Django's flexibility and scalability make it an excellent choice for building e-commerce websites. Many popular e-commerce platforms, such as Saleor and Django-Oscar, are built on top of Django.

4. Data Visualization: Django can be used to create interactive and data-rich visualizations that can be displayed on web pages.

5. IoT: Django can be used as a backend server for Internet of Things (IoT) devices, allowing you to collect and analyze data from connected devices.

6. Machine Learning: Django can be used to build web applications that leverage machine learning models, making it easy to create intelligent applications that can learn and adapt over time.

Conclusion In this guide, we explored the history of Django, how to write it with an example, and what are the best applications for it. Django is a powerful and versatile web framework that can be used to build a wide range of web applications. Whether you're building a CMS, social network, e-commerce website, data visualization, IoT device, or machine learning application, Django has the tools and flexibility to make it happen. If you're new to web development, Django is a great place to start.