Alphabet is a collection of businesses, of which central part is Google. Google operates in two main segments - Google Services and Google Cloud. All non-Google businesses are collectively referred as Other Bets.
Google Services include businesses like Android, Chrome, Gmail, Google Drive, Google Maps, Google Photos, Google Play, Search and YouTube. The main revenue sources include advertisements (Google Search, YouTube etc), but also service fees (Google Play) or subscription fees (YouTube Premium).
Google Cloud segment includes services like Google Cloud and Google Workspace. The revenue sources mainly comprise of service fees charged to users.
Other Bets include investments into emerging businesses at various stages of development.