An event is an action performed directly by a customer or triggered on behalf of the customer e.g. “Clicked a button”, “Payment failed”, “Liked an item”. At Engage, these events can be used to create customer segments for personalized engagement.

Other definitions
Google Analytics

An event is a type of hit used to track user interactions with content

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Events are actions people perform in your app, on your website, etc—things like button clicks, scrolling to the bottom of a page, or purchases.

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Computer Hope

An event is an action that occurs as a result of the user or another source, such as a mouse click.

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