nadish.. strumming is how you move your hands and strike the strings.. Like if you say, you strum you the strings downwards once.. it will probably sound like JHING and the next time if you strum it upwards it will sound like CHAK... SO that is it..
Hmm I'm talking about those spanish guitars where you play the guitar either with a playtrum or your fingers..
The rhythm depends on the strumming!! LIke JHINg CHAKA CHAKA JHIN.. and the like..