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/20201024164047/https://imgcdn.cna.com.tw/www/webphotos/WebCover/420/20201024/1383x1038_96387972132.jpg