Lesbian is a sexual orientation or romantic orientation most often defined as a woman who is attracted to women. Some non-binary people may also identify with this term (with many variations in definitions).
Although lesbians are frequently defined as women who are attracted to women exclusively/solely, they are also defined as women attracted to women primarily/mainly. Some may prefer to identify as “gay” or “gay woman”.
Other definitions/things to note:
Lesbians may be cisgender or transgender; since gender is a separate concept from sexual orientation, someone may be both trans and lesbian.
The distinction between “sapphic” and “lesbian” depends upon which definitions are used for each word. They are often thought to mean the same thing, as both refer to women who are attracted to other women. However, in contemporary usage, sapphic has become an umbrella term specifically inclusive of women with multisexual orientations (such as bisexual, pansexual, and other queer women) who may or may not be attracted to men. While “lesbian” is often – but not always – defined as a woman only attracted to other women, both terms are inclusive of non-binary and transgender identities.
Lesbian Visibility Day is celebrated on April 26 and began in 2018 in the UK.