It is a masculine noun, and can refer to:
* A leader: The head of a group, organization, or family.
* A supervisor: Someone who oversees and manages a team or department.
* A powerful figure: Someone who holds a position of authority or influence.
It is important to note that "El Jefe" can also have informal and sometimes negative connotations, depending on the context. It might be used to refer to a tough or intimidating figure, or even a criminal leader.