Butch is a masculine gender role which is usually used by those assigned female at birth. The term butch originated in communities of lesbian and bi women, in which more masculine butch women typically partnered with more feminine femmes. Because of this, butches are often assumed to be attracted to be sexually attracted to women and/or femininity, although this is not always the case.
Those who identify as butch may have the gender identity of woman but have a masculine gender expression, or they may use butch as a non-binary gender identity.