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.
the act or an instance of understating, or representing in a weak or restrained way that is not borne out by the facts: The journalist wrote that the earthquake had caused some damage. This turned out to be a massive understatement of the devastation. Origin of understatement. under- + statement.