Murder vs Manslaughter - What Is The Difference?

It is often reported that one person kills another, and instead of being found guilty of murder, they were found guilty of manslaughter. Some say this is down to 'technicalities' in the law, others say that pleading manslaughter is a way of trying to get a lesser sentence.But what are the differences in defence to both murder and manslaughter? What actions make it clear that a charge should murder, rather than manslaughter? And what are sentences given for these crimes?What about those that k...