LGBT (or GLBT) is an initialism that collectively refers to "lesbian, gay, bisexual, and transgender" people. In use since the 1990s, the term "LGBT" is an adaptation of the initialism "LGB", which itself started replacing the phrase "gay community" beginning in the mid-to-late 1980s, which many within the community in question felt did not accurately represent all those to whom it referred.
The term LGBT is intended to emphasize a diversity of "sexuality and gender identity-based cultures" and is sometimes used to refer to anyone who is non-heterosexual or cisgender instead of exclusively to people who are homosexual, bisexual, or transgender. To recognize this inclusion, a popular variant adds the letter Q for those who identify as queer and are questioning their sexual identity (e.g., "LGBTQ" or "GLBTQ", recorded since 1996).
The initialism has become mainstream as a self-designation and has been adopted by the majority "sexuality and gender identity-based" community centers and media in the United States and some other English-speaking countries.
The initialisms are not agreeable to everyone that they literally encompass. On the one hand, some intersex people who want to be included in LGBT groups suggest an extended initialism "LGBTI" (recorded since 1999). This initialism "LGBTI" is used all parts of "The Activist's Guide of the Yogyakarta Principles in Action. On the other hand, some individuals of one group may feel no relation to the individuals in other groups denoted and find such persistent comparisons offensive. Some argue that transgender and transsexual causes are not the same as that of "LGB" people. A correlative to these ideas is evident in the belief of "lesbian & gay separatism", which holds that lesbians and gay men should form a community distinct and separate from other groups normally included. Other people also do not care for the term as they feel the lettering comes across as being too politically correct, an attempt to categorize various groups of people into one gray area, and that it implies that the issues and priorities of the main groups represented are given equal consideration.