A points decision is a winning criterion in several full-contact combat sports, such as boxing, kickboxing, Muay Thai, mixed martial arts and others sports involving striking unlike normal decisions where there is three judges that agree on which fighter won the match the fight is scored by the referee, who determines who wins the bout.
In boxing, in some matches the referee is responsible for scoring (round by round) which fighter he or she feels is winning (and losing). Sometimes it denotes that the actual scores are unknown.
A unanimous decision is also sometimes referred to as a "win on points".
References
Points decision Wikipedia(Text) CC BY-SA