A counselor internship is typically a training position for students studying mental health, clinical psychology, or substance abuse therapy, or recent graduates of such programs. Graduate students who are preparing to enter into practice often need to complete an internship or fellowship as part of their educational requirements. As a counselor intern, your responsibilities include observing licensed practitioners during counseling sessions, learning diagnostic and therapeutic approaches to different mental health issues, and performing administrative duties, such as taking patient histories and completing insurance reimbursement and billing paperwork.