1. Special children refer to children with special educational needs who are different from ordinary children in physiology, psychology and intelligence. Its special needs include special educational places, special educational methods, educators with special education training and teaching methods.

2. ADHD, also known as ADHD syndrome, refers to a comprehensive disease that occurs in childhood and its behavior is extremely disproportionate to its age. It is characterized by obvious inattention, excessive activity, impulsiveness and learning difficulties.

3. Sick children, also known as children with health disorders, refer to children who suffer from chronic diseases for a long time, are weak and need special care and education. Common diseases are: cardiovascular diseases, respiratory diseases, endocrine system diseases, nervous system diseases and so on.

Significance of preschool special children's education

Preschool education and special education are two closely related majors, and special children's education is also a category of preschool education research, and preschool special children's education can also be said to be a kind of special education. Special education is not only aimed at children with physical defects, but also includes a wide range of special children, including children above and below the average normal level.

Many people don't know what preschool education for special children is like. In fact, why should we call them special children? Because these children belong to children with some physical problems, their main difference is not that special children are stupid, but that special children need to be taken care of slowly and need to be taken care of more than normal children. Children in preschool education can do something they like, but they need to pay attention to some problems often.