Deaf culture is the set of social beliefs, behaviors, art, literary traditions, history, values, and shared institutions of communities that are influenced by deafness and which use sign languages as the main means of communication. When used as a cultural label especially within the culture, the word deaf is often written with a capital D and referred to as “big D Deaf” in speech and sign. When used as a label for the audiological condition, it is written with a lower case d.
Members of the Deaf community tend to view deafness as a difference in human experience rather than a disability or disease. Many members take pride in their Deaf identity. Deaf people, in the sense of a community or culture, can then be seen as a minority group, and therefore some who are a part of this community may feel misunderstood by those who don’t know sign language. Another struggle that the Deaf community often faces is that educational institutions usually consist primarily of hearing people. Additionally, hearing family members may need to learn sign language in order for the deaf person to feel included and supported. Unlike some other cultures, a deaf person may join the community later in life, rather than being born into it.
— Deaf culture, Wikipedia, en.wikipedia.org/wiki/Deaf_culture