Salesforce Connect allows one to connect their Salesforce org to a third party database or another Salesforce org virtually without any code.
License: Salesforce Connect add-on
External Data Source as the name says is the external system from where we want the data in Salesforce.
Type
Salesforce Connect
Authentication: Per User or Named Principal
Below is a link to a trailhead module which describes the basics. https://trailhead.salesforce.com/en/content/learn/projects/quickstart-lightning-connect
Rahul Yadavansh 
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