Most of web application have their own database. A database is a collection of data. This is a place in which you will store all information about users, all your blog post texts, etc..

We will be using a PostgreSQL database to store our data. It would be easier to just use a default Django database called sqlite, but it's not good for a production use. If you want to have your application available in the Internet, not only your computer, you will need PostgreSQL.

PostgreSQL is recommending to install it using a program you can find here: http://www.enterprisedb.com/products-services-training/pgdownload#windows

Choose a newest version available for your operating system. Download this Installer, run it and then follow the instructions available here: http://www.postgresqltutorial.com/install-postgresql/

The easiest way is to download a free [Postgres.app](http://postgresapp.com/) and install it like any other application on your operating system.

Go ahead, download it, drag to the Applications folder and run by double clicking. That's it!

Of course, installation depends on Linux distribution. We've added most popular ones, but if you can't find yours, [here are all the tutorials](https://wiki.postgresql.org/wiki/Detailed_installation_guides#General_Linux).

Go to your console and run following command:

sudo apt-get install postgresql postgresql-contrib

sudo yum install postgresql93-server

Now we need to create our database user and our first database!

First, let's make our console into postgres mode:

$ psql

psql (9.3.4)

Type "help" for help.

#

Our `$` now changed into `#`, it means that we're now giving commands to PostgreSQL. Let's create a user:

# CREATE USER name;

CREATE ROLE

Of course, replace `name` with your own name. Now it's time for a database for your Django project:

# CREATE DATABASE djangogirls OWNER name;

CREATE DATABASE

Awesome! All ready.

(blog) ~$ pip install psycopg2

Downloading/unpacking psycopg2

Installing collected packages: psycopg2

Successfully installed psycopg2

Cleaning up...

There is a number of different database systems that store data for you. We will use one of the best ones: `PostgreSQL`, which we installed in __Database__ chapter.

Find this part in your `mysite/settings.py` file:

DATABASES = {

'default': {

'ENGINE': 'django.db.backends.sqlite3',

'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),

}

}

And replace it with this:

DATABASES = {

'default': {

'ENGINE': 'django.db.backends.postgresql_psycopg2',

'NAME': 'djangogirls',

'USER': 'yourname',

'PASSWORD': '',

'HOST': 'localhost',

'PORT': '',

}

}

Make sure to replace `yourname` with a user name you created in __Database__ section. Then save a file.