Click-to-Call is a clickable phone link or button, especially on mobile, that starts a phone call.
It matters because more traffic is not always the answer. CRO and lead generation terms help teams improve the path from visitor to qualified opportunity, often producing more revenue from the same audience.
Example
A mobile visitor taps a phone link and their device opens its calling interface. The tap indicates calling intent, but it does not prove the call connected or resulted in a qualified conversation.