I just purchased a skoda octavia mk 3 and it has no sd can someone please explain what this is and what does it do is It needed? 

As you have a Bolero, the only reason for using a SD card is to either put radio logos or music on.

 

Any standard SD card will be fine, it doesn't need to be a Skoda branded one

If I get a skoda sd can I get maps with it? 

Nope as the bolero isn't a sat nav 😉

Thanks for the information