Graphics and video
For a list of games, see games with widescreen resolution support.
Widescreen resolutions are resolutions that are of a 16:9 (more common) or 16:10 (slightly less common) aspect ratio. The majority of computer monitors and TV's produced today are widescreen, and thus feature a native widescreen resolution. Widescreen resolutions can cause problems with older games that were built for a 4:3 screen, resulting in either a stretched screen or black bars of unused screen space. Most games today will feature built in support for widescreen resolutions, while some games may require tweaking to force such a resolution.
If a full-screen game is rendered at the wrong aspect ratio, the effects vary based on the monitor. Some may stretch the image, while others may instead pillarbox. Use GPU scaling to override monitor behaviour.