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What is Deaf-mute and explain in detail?
Deaf-mute is a term which was used historically to identify a person who was either deaf and used sign language or both deaf and could not speak. The term continues to be used to refer to deaf people who cannot speak an oral language or have some degree of speaking ability, but choose not to speak because of the negative or unwanted attention atypical voices sometimes attract. Such people communicate using sign language. Some consider it to be a derogatory term if used outside its historical context; the preferred term today is simply "deaf".

Historical usage of "deaf-mute" and other terms
United Kingdom
In 19th century British English "mute" and "dumb" meant "non-speaking", and were not pejorative terms. For example, in 1889 Queen Victoria instigated the Royal Commission on The Blind, the Deaf and Dumb etc.in the United Kingdom. The intention was to examine contemporary education and employment of blind or deaf people, with a view to improving conditions for them. The Oxford English Dictionary states that the North American pejorative usage of the word to imply stupidity was first noted in the UK in 1928. According to the OED, "deaf-mute" was coined in the early 19th century as a medical term for an inability to speak as a consequence of deafness. There is no mention of offensiveness of this term in the UK.

North America
The primary definition of "dumb" in Websters Dictionary is "lacking intelligence" or "stupid". Its second definition of the word is "lacking the ability to speak ... now often offensive". Websters definition of "mute", on the other hand, gives the adjectival meaning as "unable to speak", whereas one of its usages as a noun is "a person who cannot speak ... sometimes offensive".In informal American English the terms "mute" and "dumb" are sometimes used to refer to other hearing people in jest, to chide, or to invoke an image of someone who refuses to employ common sense or who is unreliable. In the past deaf-mute was used to describe deaf people who used sign language, but in modern times, the term is frequently viewed today as offensive and inaccurate.  From antiquity (as noted in the Code of Hammurabi) until recent times, the terms "deaf-mute" and "deaf and dumb" were sometimes considered analogous to "stupid" by some hearing people