A unanimous decision is a winning criterion in several full-contact combat sport

Combat sport

A Combat sport, also known as a Fighting sport, is a competitive contact sport where two combatants fight against each other using certain rules of engagement , typically with the aim of simulating parts of real hand to hand combat...

s, such as boxing

Boxing

Boxing, also called pugilism, is a combat sport in which two people fight each other using their fists. Boxing is supervised by a referee over a series of between one to three minute intervals called rounds...

, kickboxing

Kickboxing

Kickboxing refers to a group of martial arts and stand-up combat sports based on kicking and punching, historically developed from karate, Muay Thai and western boxing....

, Muay Thai

Muay Thai

Muay Thai is a combat sport from Thailand that uses stand-up striking along with various clinching techniques. It is similar to other Indochinese kickboxing systems, namely pradal serey from Cambodia, tomoi from Malaysia, lethwei from Myanmar and muay Lao from Laos...

, mixed martial arts

Mixed martial arts

Mixed Martial Arts is a full contact combat sport that allows the use of both striking and grappling techniques, both standing and on the ground, including boxing, wrestling, Brazilian jiu-jitsu, muay Thai, kickboxing, karate, judo and other styles. The roots of modern mixed martial arts can be...

 and others sports involving striking

Strike (attack)

A strike is an attack with an inanimate object, such as a weapon, or with a part of the human body intended to cause an effect upon an opponent or to simply cause harm to an opponent. There are many different varieties of strikes...

 in which all three judges agree on which fighter won the match.

In boxing, each of the three judges keep score (round by round) of which fighter he / she feels is winning (and losing). A decision isn't required to be unanimous for a boxer to be given a victory. Unaninmous decision shouldn't be confused with a majority decision

Majority decision

A majority 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...

 or split decision

Split decision

A split 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 in which two of the three judges score for the same fighter as the winner, while the third judge scores for the other...

.

A unanimous decision is also sometimes referred to as a "win on points".