Nen is a fictional concept from the manga and anime series Hunter x Hunter, created by Yoshihiro Togashi. It refers to a technique that allows individuals to use and manipulate their life energy, known as aura. This energy can be harnessed for various abilities, enhancing physical strength, speed, and even granting unique powers. The practice of Nen involves several key principles, including Ten, Zetsu, Ren, and Hatsu. Each of these techniques plays a crucial role in controlling and utilizing aura effectively. Mastery of Nen can lead to significant advantages in battles and personal growth for characters within the series.