Infinite Tsukuyomi is a technique that has been proposed by Obito Uchiha, though no actual user has ever been known to exist due to the requirements of the technique. The technique was once the goal of Obito's Eye of the Moon Plan.
Obito's Eye of the Moon Plan involves acquiring the Ten-Tailed Beast's power and body, which resided in the moon, which allows him to cast his Sharingan's reflection upon the moon in a so-called an "Infinite Tsukuyomi", which would then project its effect throughout the entire world, effectively letting him conquer it. However, while it is unknown if Obito is capable of using the normal Tsukuyomi, which is another requirement of the technique, Madara Uchiha most likely can, as a user needs to awakened both Tsukuyomi and Amaterasu in order to use Susanoo.
Without the tremendous power of the Ten-Tails, however, the technique is unusable. This leads one to believe that it costs a truly large amount of chakra in order to utilize the technique, meaning that most Uchiha could not ever hope to have use of the technique.