Salesforce Report Type and supported feature
Salesforce has 3 type of report Tabular (By default)SummaryMatrix * Row limit required.
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Type of external salesforce connect
Ways to Connect External System Using Salesforce Connect in Apex Salesforce supports 3 way to connect external system using Salesforce Connect oData 2.0 or oData 4.0Cross Org AdapterCustom Adapter using Apex Connector Framework oData 2.0 or oData 4.0: oData is Open Data Protocol. REST
External Object vs Custom Objects
Difference Between Salesforce External Objects & Custom Objects Here is quick look