Recent Contacts is a feature in IBM Notes that keeps track of users' most frequent contacts to improve email addressing. It analyzes communication patterns and prioritizes recent contacts at the top of typeahead lists. The document discusses improvements to Recent Contacts over releases, how it handles roaming users, and ways to manage unwanted contacts or invalid addresses, such as marking them as "Hide in Typeahead". It provides an overview of how Recent Contacts works and its benefits for addressing accuracy and performance.