Salesforce supports 3 way to connect external system using Salesforce Connect
- oData 2.0 or oData 4.0
- Cross Org Adapter
- Custom Adapter using Apex Connector Framework
oData 2.0 or oData 4.0:
oData is Open Data Protocol. REST based integration. This is standard way to connect your external system if Salesforce supports or External system supports.
Cross Org Adapter:
Get data that stored in another salesforce org. Used Force.com REST API to integrate with another salesforce org.
Apex Connector Framework:
you need to build your own connector using Apex connector framework in Force.com platform.
Nice post. An interesting solution that helps produce odata for salesforce connect can be found here: https://www.progress.com/data-connectivity/odata-salesforce-lightning-connect .
Here is also a blog that outlines how to access external data from salesforce using OData: https://www.progress.com/blogs/lightning-fast-data-integration-with-salesforce
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