Slack is introducing a "Mark as Read" option in the notification window for its Android app, allowing users to mark messages as read directly from notifications without opening the app. This feature is currently being rolled out to Android users, while desktop users have had similar functionality through keyboard shortcuts. The update is part of a phased rollout, meaning not all users will have access immediately. Additionally, Slack recently launched 25 new AI applications in its marketplace to enhance productivity across various professional tasks.