What is CTA (Call to Action)?

A CTA (call to action) is the explicit instruction telling the viewer what to do next — "Shop now", "Get 20% off today", "Tap the link" — appearing in the ad's script, on-screen text, and the platform's button.

The mechanics

Ads without a clear next step leak intent: viewers can be convinced and still scroll on because nothing directed them. Strong CTAs are specific about the action and the reason to act now (offer, deadline, scarcity that is actually true), and they match the landing page so the click feels continuous. In video ads, the spoken CTA, the on-screen text, and the button should reinforce each other rather than say three different things.

Signals that matter

• Good: one clear action per ad, repeated verbally and visually near the end
• Bad: vague closers like "check us out" with no reason to act now
• Bad: a CTA promising something ("get the bundle") that the landing page does not immediately show

Putting it to work

CTA phrasing is a legitimate test variable — urgency framings, offer-led closers, and soft asks can perform very differently by audience. Since Polaris generates finished UGC videos from your script inside Claude, spinning the same ad with three different closing CTAs is a one-batch test rather than a re-shoot. See the full ecommerce ads glossary, or put it into practice with the Polaris AI UGC ad generator.