Shadow Clone Technique (Earth-2356)

The Shadow Clone Technique is a Force clone technique created by Tobirama Senju. This technique allows the user to create one or more copies of themselves. The user's midi-chlorians are evenly divided between themselves and their clones: creating one clone will give it half the user's midi-chlorians, creating two clones will give each a third of the user's midi-chlorians, and so on. Depending on how much midi-chlorians the user has and how many clones they make, this rapid depletion of their reserves can be dangerous. Because of this, usually only those of at least Jedi Master or Sith Lord-level Force users can safely use the standard Shadow Clone Technique. The Multiple Shadow Clone Technique – which creates hundreds of clones to the standard version's dozens – is unsafe to the point of being forbidden. Anakin Skywalker and Luke Skywalker  are an exception to this rule; because both had access to the Force of the Nine-Tails, and could create hundreds of clones without worry.

Unlike the basic Clone Technique, shadow clones are physically real. They possess the same clothing, damage, and transformations as the user at the time of their creation. Most tools and weaponry are copied when the shadow clones are created, but complicated technology won't be duplicated. Because they are visually identical and possess the same midi-chlorians as the user, shadow clones are indistinguishable from their original, not even by ocular Force techniques; Darth Sidious could identify shadow clones using his Rinnegan.

Source

 * https://naruto.fandom.com/wiki/Shadow_Clone_Technique.