What type of reactions can be used in Slack?

Slack allows users to utilize any emoji from the emoji picker for reactions, making it a versatile platform for expressing emotions or feedback in a conversation. This functionality enhances communication by enabling participants to quickly convey their feelings, agreements, or responses to messages without the need for written text.

Users can select from a wide array of emojis, including standard ones and any custom emojis that have been added to the workspace, thus encouraging personalization in reactions. This flexibility is a core aspect of Slack's interactive features, helping to foster a more engaging and visually expressive communication environment.

Other types of reactions, such as only using custom emojis or predefined sets, would limit the expressive capabilities and personalization that Slack offers, detracting from the platform's intended use as a dynamic communication tool.