Great answer. The 'Prodigal' (which means 'runaway') Son is in a story told by Jesus to teach us about God's unconditional love.
The son demanded his share of his inheritance from his rich dad, went off and had a wild time in the city, ran out of money, was deserted by his 'friends', nearly starved and came crawling home to his dad, knowing he deserved nothing. His father was watching and came running to meet him, ignoring his apologies and holding a party to celebrate his return!
Jesus wanted everyone to know that, however bad we feel, God is only waiting for us to turn back to Him, and a party awaits!
Next good question:
'Who was the prodigal son's brother?'