This technique allows the user to transfer chakra to another person. It is used by many users, each one of them has shown to use technique in different ways. Certain people, such as Minato Namikaze and Naruto Uzumaki could also mould the transferred chakra in order to adapt it to another person's specific chakra type. In the latter's case, due to Kurama's chakra, it also enveloped the recipients in a chakra cloak similar to his "Version 1" form, albeit with no tails.
Katsuyu and itssummoners have a unique bond between them through White Strength 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.
The 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.
In the anime, if the Aburame member has proper control, the kikaichū are also shown able to transfer their accumulated chakra to others targets, replenishing them.
In the anime, 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.