Click-to-call is a form of digital communication that assumes a user will be connected to another individual in real-time once he clicks a link or a button.

Click-to-call links often appear in the form of buttons on websites, as well as hyperlinks in emails and videos. A connection can occur via SMS, VoIP (Voice over Internet Protocol), or phone call.

This type of digital communication allows customers to connect with a company’s rep immediately after viewing a website, ad, or any other type of marketing content.

The biggest benefit of a click-to-call option for businesses is that it allows prospects to reach out to them when they’ve just discovered a product or a service. At this point, a lead is at peak interest in a business, which increases the chances of closing a deal.

https://en.wikipedia.org/wiki/Click-to-call