What is a call-to-action button?

A clickable element on a website page, blog post, or email that promotes and redirects visitors to an offer
A pop-up form
A snippet of text that Google serves on a search engine results page (SERP)
Anybody your company communicates with in the course of doing business

The correct answer is:

A clickable element on a website page, blog post, or email that promotes and redirects visitors to an offer.