Contacts: import and export from/to SIM/SD card

I had asked some questions in the batch, but I was advised not to do so.

How to import and export contacts from/to SIM and SD card?

I've tried to explore Android Phones and Contacts, and, as I understood, import means addition new raw contact with another account name and type (for example, Google/Facebook). As I understood, export means addition new raw contact with sim account type and name.

If I understood it correctly, then what account type and name is for SIM and SD storage? I know that for different phone there are different phone account type. How can I get default account type?