Both autism and depression are characterized by varying degrees of reluctance to socialize, low verbal activity, and reduced interest, but in fact there is a fundamental difference between the two. In depression, depressed mood is one of the main clinical manifestations, and social interaction and reduced interest are related to the depressed mood. Under the dominance of this mood, there is a reluctance to engage in things that previously interested them and to engage in social activities. However, it is not the case that the person with autism is unable to establish ways of interacting with normal people, to engage in some of the activities that other normal children are passionate about, or even to establish normal attachments with their parents or closer caregivers. People with depression are not talkative and are reluctant to talk not unable to talk. People with autism have a significant language communication disorder, and their language development is significantly behind that of their peers. So this is a fundamental difference between the two, one is unable and the other is unwilling.