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.
You make an understatement when you say a lot less than you could. If you say We didn't do our best when your team loses 56 to 0, that's quite an understatement. An understatement can be just the thing to make someone feel better. For example, if you are a terrible dancer and everyone seems to be pointing and laughing at you, your friend might say your style is unique. She's not lying, but she is making sad truth easier to deal with.