Hand Seals

Seals (印, in, English TV: Hand Signs) are used to perform many ninjutsu, genjutsu, and various secret arts other than taijutsu. The exact amount of chakra necessary to perform a technique is manipulated through hand seals. There are different sequences of hand seals for every technique, requiring memorization.

Refrences
The top paragraph was borrowed from Naruto Wiki.

All seals and related techniques are property of Kazehime/n-i-k-n-a-k (on dA) and may not be used with out written permission.