They do both but most likely call.
They called me.
I received an email acquiring my availability for an interview.
I received an email
They emailed me for an interview.
They do both
Answered - Sales Associate (Current Employee) - Chicago, IL
Call about the interview
Answered - Lead Stocker/ Sales Clerk (Former Employee) - Carle Place, NY
I was called and emailed about scheduling an interview time.
Answered - Sales Associate (Former Employee) - Littleton, CO
They call you for an interview