Qt 5.0.2 Source Components - what is this?

[invader92]

At the beginning I'd like to say hello to everyone. I'm new here and I'm beginning with programming int qt.

I've just downloaded Qt 5.0.2 release and during the installation I see unchecked these options:
Source Components:
- Essentials
- Add-Ons: qttranslations, qtsvg…….

I can’t find out what is this for. Can anyone tell me what exactly this is and give me any 'usage scenario'?
I’m still a qt beginner and I would be very grateful for any answer.
Thank you in advance, and please, forgive me my language skills.

[wysota]

It's the source code.

[ChrisW67]

You would need the Qt source if, for example, you needed to build the MySql or other database plugin.

[invader92]

I thought it may have something to do in case of static linking "out of the box", but I wanted to make sure.
I know i have to build it on my own, like with previous releases, to achieve static linking.
Anyway. thank you very much for help and forgive that "vary lame" question.