What does Indonesia east timor Singapore and Brunei have in common?

Indonesia, East Timor, Singapore, and Brunei all share a location in Southeast Asia and are members of the ASEAN (Association of Southeast Asian Nations) regional organization, which promotes political and economic cooperation. Additionally, these countries have diverse cultural heritage influenced by various indigenous groups, colonial histories, and religious practices. They each have unique governance structures and economic profiles, but all are engaged in regional trade and diplomacy.