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 form of speech or disclosure which contains an expression of lesser strength than would be expected. Understatement may be employed for emphasis, for humour, or ironically. This is not to be confused with euphemism, where a polite phrase is used in place of a harsher or more offensive expression, though understatement too can be used to moderate something that might seem harsh.