This sector comprises establishments primarily engaged in providing instruction and training in a wide variety of subjects. This instruction and training is provided by specialized establishments, such as schools, colleges, universities, and training centres. These establishments may be privately owned and operated, either for profit or not, or they may be publicly owned and operated. They may also offer food and accommodation services to their students. Educational services are usually delivered by teachers who explain, tell, demonstrate, supervise, and direct self-learning. Instruction is imparted in diverse settings, such as educational institutions, the workplace, or the home (through correspondence, television, or other means). Lessons can be adapted to the particular needs of the students, e.g., sign language can replace verbal language for teaching students with hearing impairments. All industries in the sector share this commonality of process, namely, labour inputs of teachers with the requisite subject matter expertise and teaching ability.