Butch is a masculine gender role which is sometimes used as a gender identity. The term butch originated in communities of lesbian and bi women, in which more masculine butches 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.
Butch was originally used by those assigned female at birth, but has been increasingly adopted by trans women and others in the transgender community. However, it should not be confused with identifying as a trans man.