What is the full form of "CTA"?

A call to action (CTA) is a marketing term that refers to the next step a marketer wants its audience or reader to take. The CTA can have a direct link to sales. For example, it can instruct the reader to click the buy button to complete a sale, or it can simply move the audience further along towards becoming a consumer of that company's goods or services. The CTA can suggest that the reader subscribes to a newsletter that contains product updates, for example. To be effective, a CTA should be obvious and should immediately follow the marketing message.