On a website or app, what would Google Analytics 4 refer to as interactions?

In Google Analytics 4 (GA4), all user interactions on a website or app are captured as "events." This event-based data model is a fundamental shift from Universal Analytics' session-based model. Events can be anything from page views and clicks to video plays and purchases. GA4 automatically collects some events (e.g., pageview, scroll), and you can define custom events for specific interactions relevant to your business. "Conversion" is a specific type of event that you mark as important for your business objectives, like a purchase or a lead form submission. "Goal" is a term used in Universal Analytics, not GA4. "Incident" is not a standard GA4 term for user interactions.