In this case it's important to note this part of the page:
LG Smart Monitor supports clear and ideal image reproduction with 16:9 wide screen and optimal 1920 x 1080 pixels and Full HD resolution. With HDMI Connector, which is compatible with various digital entertainment devices such as Blu-ray, HD-DVD, PS3, and XBOX 360, LG Smart Monitor can recreate the visual contents of your choice in supreme quality.
16:9 & 1920x1080 is the standard for "Full HD" 1080p resolution, which is the highest "HD" available to the masses via television and other similar content right now. The way high-definition is marketed is a bit convoluted as all it really is is just a higher resolution. TVs these days are exactly like computer monitors -- in that the content detail increases with the resolution supported. 720p is 1280x720
and 1080p is 1920x1080
, which is just simplified for whatever reason.