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.
Language that is so intense or exaggerated it must be read as meaning less than it literally states; a figure of speech in which exaggeration is used in the service of truth (ex: a beggar to one who drops a penny into the tin cup: I'm rich!) Understatement (litotes): saying less than one what really means.