What are two different deaf and Deaf?

Deaf (with a lowercase "d") refers to a person who has a hearing impairment that is severe enough to affect communication. This can include people who are completely deaf, as well as those who have some residual hearing.

Deaf (with a capital "D") refers to a person who is part of the Deaf community, which is a cultural and linguistic minority group. Deaf people share a common language, American Sign Language (ASL), and have a distinct culture that is based on shared experiences of hearing loss.

While all Deaf people are deaf, not all deaf people are Deaf. Some deaf people may not identify with the Deaf community and may prefer to use spoken language or other communication methods. Additionally, some Deaf people may have only partial hearing loss and may not consider themselves to be deaf in the same way that someone with complete hearing loss does.