Final answer:
Class E airspace is where no separation services are provided to VFR aircraft and no ATC communication is required. This airspace is primarily for IFR operations, but VFR flights are allowed to operate while maintaining their own separation.
Step-by-step explanation:
The controlled airspace where no separation services are provided to VFR (Visual Flight Rules) aircraft and no communication with Air Traffic Control (ATC) is required is Class E airspace. Class E airspace is designed primarily for Instrument Flight Rules (IFR) operations, but VFR flights are also permitted. While ATC does not provide separation services for VFR aircraft in Class E airspace, IFR aircraft do receive separation services. VFR pilots are expected to maintain their own separation from other aircraft by adhering to 'see and avoid' principles and are encouraged, but not required, to communicate with ATC.