What does call to action mean?

call to action meaning in Law Dictionary

proactive approach (CTA) is a business that advocates for a number of liberal reasons to improve the Catholic Church.

call to action meaning in Business Dictionary

terms that encourage your reader, listener, or viewer of a sales advertising message to simply take an immediate activity, such as for example "Write today," "Call today," or (on Internet) "click the link." A retail ad or commercial without a call-to-action is regarded as incomplete and inadequate.