Redownloads refer to instances where an existing app user downloads the app again after previously deleting it, or downloads the same app on another device they own. This could happen if the user sees an ad for the app and taps to redownload it, or happens naturally through cross-device use of the app. Tracking redownloads provides insight into retention and recapture rates among your existing customer base – how well you can bring back users who may have previously tried the app but removed it. It complements metrics like unique downloads that focus on new customer acquisition.