Chaitanya is correct: you should have googled first because the answers there are more complete than what we can provide here.
However, you might want to hear from our experiences with Linux so here let me try to share by replying your questions:
Questions: ""my basic question is..."
1. "does "slackware" works like "windows" with Graphical user interface(GUI)?"
YES. Gnu/Linux have better windowing choices because there are many "windowing" managers available FOR FREE, not like Microsoft where you only have what Redmond offers, you can only change your wallpapers and themes. >-(
2. "can i have windows and slackware in same machine ??? if so how to install it?"
YES. This is the beauty with Linux and GRUB. You can do it by what we usually call "Dual-Booting" or "Multi-Booting" and many Linux users are multi booting. Me for one.
3. "can i install anyother applications like yahoo messenger, Vlc Player, Quicktime player, real player, winamp and ofcourse animation software like autodesk maya and image editing software like photoshop on slackware????"
YES. Running Gnu/Linux, I swear you have better applications there than what you are listing above. However, some distros don't preinstall "encumbered" or none free programs, in this case, free software has more than one substitutes. Slackware for one is hesitant to use non-free-software.
4. "wat is slackware and linux??? are there any difference????"
LINUX is ... download and read this tutorial: http://www.freebookcentre.net/unix-b...heer)-PDF.html
and SLACKWARE is ... read this: http://www.slackware.com/
5. "please educate me to use linux. cos i like the idea of open source software."
The best way to get educated is to "read" a good tutorial, which I have given you above or hereunder my signature, and "use" what you understood from that tutorial. Reading a good tutorial and using what you learn is the shortest process.
BY THE WAY, if you are new to Gnu/Linux DO NOT INSTALL SLACKWARE YET. This distribution is not meant for those who need "ease of use" approach. I recommend you Ubuntu, Linux Mint, Fedora or SuSe. Slackware needs more manual configurations which you are not yet prepared. Slackware installation boots you into a black terminal (DOS Prompt) and there you are given "Congratulations! Slackware installation is complete." So if you expect a GUI after boot like XP don't go for Slackware yet. Slackware is for the advanced users.
Hope this helps. Enjoy.