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/20160207183619/https://abs.twimg.com/c/swift/en/bundle/timeline.9bddd0d043863cf0f961d46bffa4842d3a306bd2.js