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/20240524113703/https://static.whatsapp.net/rsrc.php/v3/yO/l/0,cross/zkmfh5mjXuB.css?_nc_x=Ij3Wp8lg5Kz