How to save video from you tube

salaam...
Do u guys know how to save video from you tube??


please click here
credit to bro adri who was kindly enough to show it to me

p/s janganla save benda2 merepek dan tak berfaedah plak e.g. anime, cerite jepun dan yang sewaktu dengannya [ sorry if anyone doesn't agree with me or terase :) ]