Why is an internet connection important for payroll verification?

https://quickbookhelpdesk.com/blog/quickbooks-payroll-subscription-issues/

QuickBooks uses an internet connection to verify your payroll subscription and download payroll updates. An unstable connection may interrupt this process. QuickBooks payroll subscription issues can interrupt payroll processing and delay important business tasks, but they are often caused by temporary communication problems, outdated software, incorrect account information, or expired subscriptions rather than serious software failures.