What feature allows users to indicate their current activities on Slack?

The feature that allows users to indicate their current activities on Slack is the status feature. Setting a status enables users to communicate their availability or what they are currently doing without the need to send a message directly. For instance, a user might set their status to "In a meeting" or "Out for lunch," offering instant visibility to team members about their current situation. This feature contributes to better communication and understanding among teammates, enhancing collaboration within the platform.

The other options focus on different aspects of Slack's functionality. Messages are the primary way to communicate within channels and direct messages but do not inherently convey a user's current state. Threads are a way to organize conversations around specific messages, keeping discussions on topic, but they do not serve to show a user's activity. Notifications help users stay updated on messages and activities but do not provide a means for users to express their current activities or availability. Thus, the status feature stands out as the specific tool designed for this purpose.