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.
An understatement is a figure of speech that intentionally underplays the thing you're talking about. For example, if there's a severe rainstorm outside, and you say, it's a little bit damp-that's an understatement. You're really downplaying what's actually happening.