Special education includes hearing impairment, visual impairment and intellectual impairment. Now, generally speaking, students with hearing impairment and visual impairment are put in a school, commonly known as a school for the deaf. Students with mental retardation become independent schools, commonly known as weak schools. In some places, these three types of students are put together. Look at how they are arranged in various places. Hearing-impaired students are what we call deaf people, but they also need to communicate in sign language in different degrees, and their intelligence is normal. Visually impaired students are blind as the saying goes. Everything else is normal, except that you can't see, and your eyesight is graded. Mental retardation is the most serious kind. Their intelligence lags behind that of normal children, and their physical function is not as good as that of normal children, but there are some special circumstances that are rare. Now special education is mainly about educating these children. I hope the answer can help you. If you don't understand anything, you can continue to ask.