They are a person who endures great suffering on behalf of their belief and willingly suffers death rather than renounce his or her religion.
Saints are our role models, so are the Martyrs. They have an amazing message for us through their dedication and trust. Their belief and faith is so strong and they are so dedicated to God that they are willing to die rather than deny Him.
In our lives, we may be comforted with the knowledge that we are surrounded by a great cloud of witnesses that help us to run the race set before us. Saints and martyrs are not superhuman men and women but sinners just like me and you. We pray that we will never walk in their final steps of the martyrs, but If ever we are placed in the situation of choosing our life or renouncing God, we pray that we have the strength that they have demonstrated.