The Internet Archive discovers and captures web pages through many different web crawls.
At any given time several distinct crawls are running, some for months, and some every day or longer.
View the web archive through the Wayback Machine.
HDTV, or High Definitiion Television, refers to TVs with at least a 1280x720 display resolution, and a 16:9 aspect ratio. Some newer HDTVs feature a 21:9 aspect ratio, closer to that of traditional cinema movies.