the data so now there's two types of compression lossy versus lossless compression in this lecture we'll be fully focused on lossless compression where the original bits can be completely reconstructed on the output now sometimes in practice you might care about lossy compression you say well I don't need all the details back as long as I can save more bits I'm happy to lose some detail that would be loss of compression not the topic for this class but also a topic you might be interested in at some point so I want to make sure