How do I transfer contacts from my pc to the sd card?

I have contact on my pc in .csv excel. I have a sd card adapter that i can use to plug the sd card into my pc usb port. What format does the excel file need to be in or does it need to be a txt file? What headers should the file contain if any?
Thanks,
Lee

Welcome to Android Central! If you use Google Contacts, I highly recommend importing the contact directly to your Google Contacts on the web: https://support.google.com/mail/answer/1069522?hl=en. This will sync automatically to your phone.