How do I create a phone call button on my business's website?

I've seen HTML buttons popping up on large business websites that allow users to click the button to receive a phone call from the prospective business. And just today, I saw the cool JavaScript feature that Google Maps has added where they can connect you to any business on their listing for free. Does anyone know of some free JavaScript or Html that will do something similar to this? And if yes, where can I find it?

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