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.