whichone is better gtk+ or qt?

[muhammedda]

first of all i cant understand difference where between qt and gtk?
and whichone is better ? why?

[oz]

Some applications require Qt to run, while others need Gtk(2). Many applications will run without either.

The one that works with the applications that you like is probably the best option for you. Note that you can also mix them on the same system if you like applications that require one them, and other applications that require the other.

Have fun with Qt, and/or Gtk, and Linux.

[GNU-Fan]

first of all i cant understand difference where between qt and gtk?

Both are libraries for implementing a standard graphical user interface in your application. QT is a project of a company (Trolltech, part of Nokia), while GTK is more community driven. So the project management and decision process differs.
However, both are free software with an active community behind them.

KDE is based on qt, XFCE and GNOME on gtk.

and whichone is better ? why?

As it is the case so often in the GNU/Linux area, this lies in the eye of the beholder. I use GNOME on my computer, so I prefer GTK as it gives my programs a look consistent with most other applications on my system.

A KDE user would most probably see QT as the natural choice.