Formerly, those updates pushed through comprehensive service packs, but more often these days, they’re semi-regular and significant updates through Windows Update.
In fact, in Windows 10 and Windows 8, the service pack, as we know it from previous versions of Windows, is essentially a dead idea. Much like updates on your smartphone, Microsoft is continually adding major features through automatic patching.
As of October 2021, the last major update to Windows 10 is Windows 10 Version 21H1, referred to as the Windows 10 May 2021 Update. Updating is automatic through Windows Update.