Being invited for a Coop interview gives you the opportunity to expand on details provided in your CV. It means that your CV has succeeded. Someone is interested in you, and they want to know more! Many employers come on campus to interview but some prefer to interview at their own premises. For global placements, employers will typically interview by phone or Skype.
An interview has been described as "a conversation with a purpose". So you should see yourself as an active participant. Preparation is key! Your Cooperative Education employability workshops will help you to prepare for interviews.