(plural: ‘amateurs‘; the word opposite in meaning: ‘professional’)
a talented person, such as a painter, artist, actor, sportsperson, student of fine arts, musician, scientist, photographer, etc., who takes part in that field of activity with or without training and just for enjoyment but not for money,
amateurs usually show their talent in the school/college/university exhibitions or in the public shows of some non-profit or charity organisations.
Sergio Espinoza is an amateur boxer, but Mike Tyson is a professional boxer. (i.e. Sergio fights in the ring for pleasure or title but Tyson fights for the title and the prize money that comes with the title)