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Sami MSami M 

how real time integration with Salesforce.com works.

AbhishekAbhishek (Salesforce Developers) 
A Salesforce integration solution is a piece of software that establishes and manages communication between Salesforce CRM and other systems, using APIs to interpret messages that systems exchange.

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.