Short answers, pulled from the story.
Judas Iscariot lived in the first century AD as one of the twelve apostles chosen by Jesus Christ. The earliest possible reference to him appears in the First Epistle to the Corinthians written by Paul the Apostle around 54 AD.
Judas Iscariot betrayed Jesus to the Sanhedrin in the Garden of Gethsemane for thirty pieces of silver after identifying Jesus to the arresting crowd by kissing him on the cheek. Matthew states Judas committed the betrayal specifically for money while Luke and John suggest Satan entered Judas at that time.
Matthew states Judas Iscariot hanged himself after throwing down thirty pieces of silver because priests refused blood money. Acts of the Apostles quotes Peter saying Judas bought a field called Akeldama or Field of Blood where he fell headlong bursting asunder with bowels gushing out.
A Coptic papyrus codex discovered near Beni Masah Egypt during the 1970s relates conversations between Jesus and Judas discussing the nature of the universe from a Gnostic viewpoint. The text portrays Judas actions as done in obedience to instructions given by Jesus distinguishing the Old Testament God called Demiurge from the true unknowable God known as Monad or One.
Christian theology debates whether Judas Iscariot is damned due to despair causing suicide or free will exercised in betrayal. Pope Leo I stated had Judas not denied omnipotence he would have obtained mercy while Vatican II spoke generally about eternal fire but proclaimed individuals Eternal Salvation only through Canon of Saints.
Judas has become archetype of traitor in Western art and literature since Middle Ages often shown with red hair in Spanish culture known as pelo de Judas. Caravaggio painted The Taking of Christ in 1602 showing famous depiction of his kiss of betrayal while Tim Rice and Andrew Lloyd Webber released rock opera Jesus Christ Superstar in 1970 centered on Judus dissatisfaction with how Jesus steers disciples.