Ustadh is the Arabic word for "Teacher" or "Professor." While it can be used for any educator, in an Islamic context, it specifically refers to a teacher of religious sciences, Arabic grammar, or Quranic studies. An Ustadh is someone who not only transmits information but also helps shape the character and "Adab" of their students. The relationship between an Ustadh and a student is considered sacred in Islam, based on the principle that "knowledge is a light" passed from heart to heart. It is a title that carries the weight of responsibility for the next generation's intellectual and moral growth.