A "sensei" is a Japanese term that means "teacher" or "instructor." It is commonly used in martial arts, such as karate and judo, to refer to someone who has attained a high level of expertise and is responsible for training students. The sensei not only teaches techniques but also imparts important values like discipline, respect, and perseverance. In addition to martial arts, the term can also apply to teachers in other fields, such as calligraphy or tea ceremony. A sensei is often seen as a mentor, guiding students through their learning journey and helping them develop both skills and character.