A teacher is someone who delivers an academic program to students, assesses those students on their accumulation of knowledge and may even provide leadership in that particular program. Teachers are very important to the success of a student's tutorship in many different applied areas of study, such as science, mathematics, languages and music.
Teachers can communicate complex ideas to students who are totally ignorant of the information, helping them to assimilate new ideas and think critically on important subjects. Teachers may also be tasked with testing these students whether through an approved exam system or some other method of assessment. Teachers are often leaders who can create study groups and class projects and even conduct field trips to provide real-world examples to students about why the topics they learn about are important for their futures.