SDTV resolution by nation; due to historical reasons, different countries use either 480i or 576i as the standard-definition picture format. Standard-definition television ( SDTV , SD , often shortened to standard definition ) is a television system which uses a resolution that is not considered to be either high or enhanced definition .
480i is the video mode used for standard-definition digital television in the Caribbean, Myanmar, Japan, South Korea, Taiwan, Philippines, Laos, Western Sahara, and most of the Americas (with the exception of Argentina, Paraguay, and Uruguay).