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![Alex Xu on Twitter: "/3 𝐓𝐡𝐞 𝐜𝐨𝐦𝐩𝐨𝐬𝐢𝐭𝐢𝐨𝐧 𝐨𝐟 𝐝𝐨𝐦𝐚𝐢𝐧 𝐨𝐛𝐣𝐞𝐜𝐭𝐬: 🔹Entity: a domain object that has ID and life cycle. 🔹Value Object: a domain object without ID. 🔹Aggregate: a collection of Entities Alex Xu on Twitter: "/3 𝐓𝐡𝐞 𝐜𝐨𝐦𝐩𝐨𝐬𝐢𝐭𝐢𝐨𝐧 𝐨𝐟 𝐝𝐨𝐦𝐚𝐢𝐧 𝐨𝐛𝐣𝐞𝐜𝐭𝐬: 🔹Entity: a domain object that has ID and life cycle. 🔹Value Object: a domain object without ID. 🔹Aggregate: a collection of Entities](https://pbs.twimg.com/media/FhDgnQlVIAEoTcs.jpg:large)