The article explains the differences between custom workflows, custom actions, and custom APIs in Dynamics 365. Custom workflows cannot be private, do not support API types, and only allow code action steps. Custom actions do not support a code-first approach, have fewer data types, and support OOB action steps. Custom APIs support more data types, can be called from Power Automate or third-party using Web API, and can create custom messages. The article also explains the difference between action and function in custom APIs.
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