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For further reference check this,
https://developer.salesforce.com/blogs/developer-relations/2015/06/integrating-force-com.html#:~:text=User%20Interface%20Integration%20is%20one,of%20entry%20into%20multiple%20applications.&text=Data%20Integration%20uses%20SOAP%20APIs%20and%20REST%20APIs.
Let me know if it helps you and close your query by marking it as solved so that it can help others in the future.
Thanks.