# send(_:to:) Sends a custom type asynchronously to other participants in the group session. ``` final func send(_ value: Message, to participants: Participants = .all) async throws where Message : Decodable, Message : Encodable ``` ## Parameters `participants` The recipients of the message. The default value of this parameter is the set of all active participants in the session. Use the [`Participants.only(_:)`](/documentation/GroupActivities/Participants/only(_:)-swift.enum.case) option to specify a subset of participants. ## Discussion Use this method to send data that you package into a custom class or structure. The method encodes your custom structure’s type information, and delivers the data only to message sequences of the same type. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)