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.
Understatement is a figure of speech in which there is a contrast between the description and reality. As such, understatement can be used to reflect modesty, sarcasm, derogatory or complimentary tone. Understatement literally refers to what is not being said. In short, the gravity of the statement is undervalued.