nonessential element
nonessential element (elemento no esencial)
extra information that can be removed without changing who or what is meant, so it is set off by commas.
Example
My boss, who is from Ohio, is very kind. (Remove the middle part and the sentence still works.)
In Spanish
nonessential element (elemento no esencial) — información adicional que se puede quitar sin cambiar de quién o de qué se habla; por eso va entre comas.
My boss, who is from Ohio, is very kind. (Si quitas la parte del medio, la oración sigue teniendo sentido.)