The highest video resolution supported by the Sony SLT-A57Y is 1920 x 1080 pixels. That's over six times the video resolution of a 640 x 480 pixels camera, which is the most common video resolution supported by similar spec cameras that came out more than two years ago. 640 x 480 pixels is also supported by this camera. This Sony camera also supports a video resolutions of 1440 x 1080 pixels. A video resolution of 1920 x 1080 pixels is equivalent to Full HD video. You will require a Full HD TV or better to appreciate this level of detail.
A 1920 x 1080 pixels video resolutions is in fact the best supported video resolution amongst all medium megapixel cameras that have been around for a similar time to this camera.
Amongst similar types of digital camera the worst supported video resolution is 320 x 120 pixels.
What does "video resolutions" mean?