call to action
US /kɔːl tə ˈæk.ʃən/
UK /kɔːl tə ˈæk.ʃən/
1.
a piece of content designed to induce a user to perform a specific act, typically a consumer responding to an advertisement or a political message
:
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The website's prominent 'Buy Now' button serves as a clear call to action.
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The politician's speech ended with a powerful call to action for citizens to vote.