This fūinjutsu employs the use of formulae to bind a jinchūriki before extracting the tailed beast from within them. When extracted, the beast initially takes the form of pure chakra, also causing the host to go into a near Version 1-like state. After being extracted, the beast takes a corporeal form. Obito Uchiha waited until Kushina Uzumaki's seal was weak enough to use this technique to extract Kurama.
In Naruto: Road to Ninja, Tobi through Menma can be seen extracting Kurama from Naruto with his Sharingan alone, without binding him with this fūinjutsu first.