Guru (Sanskrit: गुरु. IAST: guru) is a Sanskrit term that connotes someone who is a "teacher, guide, expert, or master" of certain knowledge or field...
In pan-Indian traditions, guru is someone more than a teacher, traditionally a reverential figure to the student, with the guru serving as a "counselor, who helps mold values, shares experiential knowledge as much as literal knowledge, an exemplar in life, an inspirational source and who helps in the spiritual evolution of a student."
The term also refers to someone who primarily is one's spiritual guide, who helps one to discover the same potentialities that the guru has already realized.