well d basic use of flashcard is:
wen v r learning words, u tend to forget it..so flashcards are used... a flashcard can be a cardboard type material in whch on one side u write d word and behind u write down d meanin of tht word. u cn also include a sentence in whch u cn recollect tht word easily with d meanin..
Instead of using a cardboar type material, we cn make use of a simple paper..make small chits of that paper and follow d same procedure as i hv mentioned...
Believe me i have given GRE and this flashcards made by us really helps in remembering d words whch v tend to forget....
all d best :)