Why is Jesus called the lamb of God?

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In many religions sacrifices are common practices. The prophet Moses was told by God that animals needed to be sacrificed in order to remove the sins of the people. A lamb, without defect, was often sacrificed in the time of Moses. God was showing that for our sins to be forgiven, a price has to be paid. An innocent life has to be killed, instead of our lives.
When the prophet John came , he pointed to Jesus as the Lamb of God, saying that he would take away the sins of the world. Look at this video clip of when John first pointed out Jesus to the crowds.

Watch how John points to Jesus as the Lamb of God

The video clip comes from the Lumo Project (www.lumoproject.com)

John 1:29-34

Read about how the prophet John talks about Jesus as the Lamb of God

John 1:29-34 (NIV)

29 The next day John saw Jesus coming toward him and said, “Look, the Lamb of God, who takes away the sin of the world! 30 This is the one I meant when I said, ‘A man who comes after me has surpassed me because he was before me.’ 31 I myself did not know him, but the reason I came baptizing with water was that he might be
revealed to Israel.”
32 Then John gave this testimony: “I saw the Spirit come down from heaven as a dove and remain on him. 33 And I myself did not know him, but the one who sent me to baptize with water told me, ‘The man on whom you see the
Spirit come down and remain is the one who will baptize with the Holy Spirit.’ 34 I have seen and I testify that this is God’s Chosen One.