Ubuntu has almost everything that you need in your everyday work.But it may happen that you need some extra softwares or codecs for your movies or songs.Ubuntu takes care of that too.
Everything in ubuntu is installed as packages....you can think of those packages as exe in
Windows for the time being(actually only the .deb format sofwares are like the exe in Windows)
You can also uninstall these packages too...just like you remove the softwares in windows.
