@abhishek_c ,
connection type normally refers to something like ODBC, JDBC, REST, SOAP, Ora.Net, Ole.Net etc. etc. ad infinitum (i.e. a way in which you connect to a platform/system. e.g. I connected to my Oracle Database using Ora.net, and then connected to my MySQL Database using JDBC, I selected my data, and aggregated it and uploaded it to S3 using REST over HTTPS).
You've got apples and oranges here. In your message, you've referred to two reporting/dashboarding applications (Tableau and PowerBI), two file systems (HDFS and S3), and 2 Database Systems (MySQL and Oracle) and one database language (SQL). None of these are connection types - just a broad description of what each system/language is for (noting that S3 is both the name of the file system and of the connection protocol)
By that logic, @SanfordWhiteman 's answer stands as valid. Marketo is a Marketing Automation Platform (MAP).
Cheers
Jo
... View more