A connector allows you to interact with a third-party product's functionality and data and enabling you to connect to and interact with the APIs of services such as Twitter, Gmail, and Facebook.
This will be a part of ballerina-tools-0.8.0.zip distribution [1].
To test a connector action written in Ballerina language use the run command as follows.
Copy the <Connector>/samples/<Connector>/samples.bal into <ballerina_home>/bin folder
and run the command like in below,
$ bin ./ballerina run main samples.bal
Reference: