The functions of a teacher have expanded since the introduction of computer technologies in the education industry, creating uncertainty about what a teacher is. Today, educators, facilitators, lecturers, and instructors are sometimes used interchangeably with teachers when referring  to professionals in the teaching field. This raises questions about what currently and exactly constitutes a teacher, her characteristics, and duties in the twenty-first century. What society expects from teachers in the twenty-first century is further complicated by these misperceptions. As a result, various scholars’ definitions of teacher, his/her qualities and responsibilities were examined, as well as other related concepts and societal expectations in the twenty-first century. A teacher is a professionally trained and licensed individual in teaching and learning methodologies and theories who is responsible for imparting knowledge, implementing curriculum, monitoring, and evaluating learning outcomes, communication with students and parents, organizing extracurricular activities, and advising on issues related to student education. Facilitators, instructors, and lecturers are not education specialists but assume the responsibilities of teaching students a specific methodology, subject area, or function. Hence, teachers are more professional and should not be used interchangeably with educators, facilitators, instructors, and lecturers due to their training, license, and place of work. In this century, teacher’ concept, qualities, and responsibilities have not changed but only expanded. They must be equipped with knowledge and skills to recognize individual learning styles, design differentiated instruction,
teach problem-solving strategies, use technology effectively, foster a sense of community, and develop leadership.

Keywords: education, educator, facilitator, instructor, lecturer, students, teacher, teaching.