Custom events in Google Analytics 4 (GA4) allow you to track specific interactions that may not be covered by automatically collected events. To create one, first sign in to your GA4 property and open the Admin section. Select Events under the data collection settings, then choose the option to create a new event. Give the event a clear name that describes the user action, such as download_guide or video_play. You can define conditions based on existing events and add parameters to provide additional information about the interaction. After saving the event, test it using the Realtime or DebugView reports to confirm that data is being received correctly. If the action represents an important business goal, you can mark the event as a key event. Using Google Analytics 4 custom events helps businesses measure valuable interactions and better understand how visitors engage with their websites.