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/20161013132538/https://abs.twimg.com/c/swift/en/bundle/timeline.b5479e8bfca824e70088c5f78764b30243ead353.js