Applications is the key element of a computer. Without applications/softwares, computer is useless. Ubuntu has a pretty good software installation mechanism. All the softwares are at one place in Synaptic Package Manager which. This makes it easier to install applications. Instead of browsing the application website and downloading it from there and then installing it, all the applications are at one place. Just click on the application, mark it and you have it installed without any need of your intervention.
This is by far the best thing I liked in Ubuntu. You can access the synaptic package manager from System->Administration->Synaptic Package Manager. Type the application name and it will search as you type. To install an application, just right click on the application and select ‘Mark for installation’ and click on Apply. Your application will be downloaded and installed right away.
To install the same application using terminal, you can note down the exact name of the application as it appears in the Synaptic Package manager and in the terminal type:
sudo apt-get install package-name
Type in your password and your application will be installed after downloading.
In the default setup, there are most of the important repositories already added.
Repositories are collection of software which is at one place. If you add a repository in the source list, the applications available in the repository will be available in Synaptic Package Manager.
The source file is in the path /etc/apt/sources.list
You can add or remove repositories in this file.
That was a brief explanation about the application installation procedure on Ubuntu.
I hope you liked it.