Parables are stories Jesus told which refer to everyday events where you'd expect the circumstances (if not the players), to be familiar to the audience.
What makes parables different is that the story has specific spiritual implications. Drawn into the story, we have to recognise our need to act, to believe or to change.
Today's story has two interlinked outcomes - the reality of God's judgement and our responsibility to lead fruitful lives for the Kingdom. God has great expectations so us but will always provide the mans to fur us to get involved.