A ninjutsu that creates an intangible copy of one's own body, without any substance. Since the clone itself doesn't have the ability to attack, and thus can only be used to confuse the enemy, it is mainly used in combination with other ninjutsu. It's a basic technique, but depending on one's ingenuity, it can be used effectively. The clones may not dissipate when they come into contact with something.
These clones can be easily distinguished by persons with dōjutsu. A person with normal eyes can also distinguish the clones from the original, since the clones do not have shadows and will not disrupt the area around themselves with their movement (i.e. won't kick up dust, crush grass, etc.).
Part of the requirements to graduate from Konoha's Academy and become a genin is to properly use this technique during their evaluation.Naruto Uzumaki and Rock Lee are the only two ninja known to graduate without mastering this technique (although Naruto did learn the far more advanced Shadow Clone Technique).
When Sakura performs this technique, the hand seals she uses are: Tiger → Boar → Ox → Dog.