The highest video resolution supported by the PowerShot SX510 is 1920 x 1080 pixels. That's over two times the video resolution of a 1280 x 720 pixels digital camera, which is the most common video resolution supported by digital cameras of a similar type and age to the PowerShot SX510. 1280 x 720 pixels is also supported by this camera. In addition, this digital camera support a video resolution of 320 x 240 pixels and 640 x 480 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 resolution is actually the best supported video resolution across all cameras that were launched around the same time as the PowerShot SX510.
Across comparable types of digital camera the worst supported video resolution is 640 x 480 pixels.