Winamp is a computer software program designed and customized for music. Winamp uses customizing features that the user use to find the right sound and tone for them.
If you hardware and basic software are working properly you need so called codecs.
There's lots of audio recording programs out there but if you're looking for something simple that just works, most people will use Audacity as it's free and does basic tasks well. If you're running Windows, there's also the built-in sound recorder, but it doesn't have enough features for most people. Audacity can be found by a quick google search, while you can find the sound recorder pretty easily by searching for it in your computer.
No, there are many varied and feature rich DAWs (Digital Audio Workstations) available. The PC platform has SONAR, Cubase, Reaper etc. Logic for the Mac. Recently the features of this software have diverged in as much that every one does much the same tasks but in slightly different ways. So to answer your question, the best is the one that you're used to !
No, it is a database software application.