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The Chakra Transfer Technique allows the user to transfer some of their chakra to another person.
Katsuyu and itssummoners have a unique bond between them through Strength of a Hundred Seal and they can use Remote Healing. Tsunade used this technique during Pain's invasion of Konoha, with Tsunade first transferring her healing chakra to Katsuyu, and then Katsuyu itself transferring it to the wounded villagers. Sakura used the same method of Tsunade with Katsuyu to heal wounded shinobi in Shinobi Alliance against Ten-Tails.
Tailed beasts are also able to freely share their chakra with whomever they choose, and as Kurama has noted, it is a less complicated process for them than it is for humans.
Hagoromo Ōtsutsuki is the first user of this technique to connect all humans living in the earth and gave the chakra to humanity besides their family. Hagoromo also used this technique inside of Naruto and Sasuke who are the reincarnations of Asura and Indra. He gave the power to them to defeat Madara. While using this technique, a unique entity appears behind Hagoromo which is similar to himself or his mother possess two empty eyes and third eye in its forehead.
If the Aburame member has proper control, the kikaichū are also shown able to transfer their accumulated chakra to others targets, replenishing them.
The Magaki Group uses this technique in a different way. First Nangō sends his chakra to Benten and Chūshin, and then both of them send it along with its own to Akaboshi, greatly enhancing the power of his techniques.
Kakuzu Uchiha is able to steal chakra, along with transferring it.
Yuki uses the same process of sharing her chakra as the Tailed Beasts, despite not being a Tailed Beast herself.
Jiraiya was able, on his death bed, to transfer his Six Paths chakra into one of his students.