The Lumix DMC-ZS25 supports a maximum video resolution of 1920 x 1080 pixels. That's over six times the video resolution of a 640 x 480 pixels digital camera, which is the most common video resolution supported by digital cameras of a similar type and age to the Lumix DMC-ZS25. 640 x 480 pixels is also supported by this digital camera. In addition, this Panasonic camera supports a video resolution of 1280 x 720 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.
This camera's video resolution (1920 x 1080 pixels) is in fact the best supported video resolution amongst all digital cameras that have been available for a comparable time to the Lumix DMC-ZS25.
The worst supported video resolution across similar types of camera is 320 x 240 pixels.