Good Friday, also known as Holy Friday, Great Friday or Easter Friday, is a day of mourning. The day that Christians commemorate the passion, and death of Jesus on the cross at Calvary. Many Christians spend this day in fasting, prayer, repentance, and meditation on the agony and suffering of Christ on the cross, dying for our sins.
According to the accounts in the Gospels, the Temple Guards, guided by Jesus’ disciple Judas Iscariot arrested Jesus in the Garden of Gethsemane. Judas received money (30 pieces of silver) (Matthew 26:14-16) for betraying Jesus and told the guards that whomever he kisses is the one they are to arrest. Following his arrest, Jesus is brought to the house of Annas, who is the father-in-law of the high priest, Caiaphas. There he is interrogated with little result and sent bound to Caiaphas the high priest where the Sanhedrin had assembled (John 18:1-24).
Conflicting testimony against Jesus is brought forth by many witnesses, to which Jesus answers nothing. Finally the high priest adjures Jesus to respond under solemn oath, saying “I adjure you, by the Living God, to tell us, are you the Anointed One, the Son of God?” Jesus testifies in the affirmative, “You have said it, and in time you will see the Son of Man seated at the right hand of the Almighty, coming on the clouds of Heaven.” The high priest condemns Jesus for blasphemy, and the Sanhedrin Trial of Jesus concurs with a sentence of death (Matthew 26:57-66). Peter, waiting in the courtyard, also denies Jesus three times to bystanders while the interrogations were proceeding just as Jesus had predicted.
Pilate questions Jesus and tells the assembly that there is no basis for sentencing. Upon learning that Jesus is from Galilee, Pilate refers the case to the ruler of Galilee, King Herod, who was in Jerusalem for the Passover Feast. Herod questions Jesus but receives no answer; Herod sends Jesus back to Pilate. Pilate tells the assembly that neither he nor Herod have found guilt in Jesus; Pilate resolves to have Jesus whipped and released (Luke 23:3-16). Under the guidance of the chief priests, the crowd asks for Barabbas, who had been imprisoned for committing murder during an insurrection. Pilate asks what they would have him do with Jesus, and they demand, “Crucify him” (Mark 15:6-14). Pilate’s wife had seen Jesus in a dream earlier that day, and she forewarns Pilate to “have nothing to do with this righteous man” (Matthew 27:19). Pilate has Jesus flogged and then brings him out to the crowd to release him. The chief priests inform Pilate of a new charge, demanding Jesus be sentenced to death “because he claimed to be God’s son.” This possibility filled Pilate with fear, and he brought Jesus back inside the palace and demanded to know from where he came (John 19:1-9).
Coming before the crowd one last time, Pilate declares Jesus innocent and washed his own hands in water to show he has no part in this condemnation. Nevertheless, Pilate hands Jesus over to be crucified in order to forestall a riot (Matthew 27:24-26) and ultimately to keep his job. The sentence written is “Jesus of Nazareth, King of the Jews.” Jesus carries his cross to the site of execution (assisted by Simon of Cyrene), called the place of the Skull, or “Golgotha” in Hebrew and in Latin “Calvary”. There he is crucified along with two criminals (John 19:17-22).
Jesus agonizes on the cross for six hours. During his last 3 hours on the cross, from noon to 3 p.m., darkness falls over the whole land.  With a loud cry, Jesus gives up his spirit. There is an earthquake, tombs break open, and the curtain in the Temple is torn from top to bottom. The centurion on guard at the site of crucifixion declares, “Truly this was God’s Son!” (Matthew 27:45-54).
“What is Good Friday”-Ask.com
“Why Good Friday is Observed”- The Times of India