The Call to Action is both the button label Meta attaches to an ad (chosen from a preset list like 'Shop Now,' 'Learn More,' or 'Sign Up') and, more broadly, the explicit instruction given to the viewer about what to do next. A mismatched CTA — using 'Learn More' on an ad that's really asking for a purchase — can create friction or confusion right at the moment of conversion.
Testing CTA button copy is a smaller but still measurable lever in creative testing, and agencies match the CTA button to the actual next step in the funnel (a lead form gets 'Sign Up,' a straight sale gets 'Shop Now') rather than defaulting to the same button across every campaign type.
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