Focused crawls are collections of frequently-updated webcrawl data from narrow (as opposed to broad or wide) web crawls, often focused on a single domain or subdomain.
The Wayback Machine - https://web.archive.org/web/20190405123328/https://accounts.google.com/ServiceLogin?passive=1209600&osid=1&continue=https://plus.google.com/107184756052365332097/posts&followup=https://plus.google.com/107184756052365332097/posts