A call-to-action (usually abbreviated as CTA) is an image or line of text that prompts your visitors, leads, and customers to take action. It is, quite literally, a "call" to take an "action."
The action you want people to take could be anything: download an ebook, sign up for a webinar, get a coupon, attend an event, etc. A CTA can be placed anywhere in your marketing -- on your website, in an ebook, in an email, or even at the end of a blog post.
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