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 - http://web.archive.org/web/20150313171018/http://cdn.taboolasyndication.com/libtrc/static/thumbnails/759bc49732394dde468c8d65a464e1a4.png