The key difference between DVD and Blu-ray/HD-DVD is that DVD is a standard definition format in which disc information is encoded in 480i resolution, while Blu-ray/HD-DVD disc information can be encoded up to 1080p.
Definition of Understatement. Understatement is way of speaking which minimizes the significance of something. When using understatement, a speaker or writer often employs restraint in describing the situation at hand and uses an expression with less emphasis or strength than would be expected.
For example, examples of understatement can be found in the Old English epics like Beowulf as well as Ancient Greek texts by Homer. Sometimes authors use understatement for humorous reasons, though more often it is a technique for minimizing one thing thereby emphasizing another.