Whether Air Traffic Control (ATC) communication is required in Class E airspace depends entirely on whether you are flying under VFR (Visual Flight Rules) or IFR (Instrument Flight Rules). For VFR pilots, two-way radio communication with ATC is not required, and you do not need a clearance to enter or operate within Class E. You are simply required to maintain specific weather minimums (usually 3 miles visibility and specific cloud clearances) and "see and avoid" other aircraft. However, for IFR pilots, Class E is controlled airspace, meaning they must be in contact with ATC, possess an active flight plan, and have received a specific clearance to operate. Class E is often described as "Class Everywhere" because it fills the gaps between other controlled airspaces starting at 1,200 feet (or 700 feet) AGL. While VFR pilots can fly through it silently, they are highly encouraged to use "Flight Following" services for an extra layer of safety, even though it is not a legal mandate like it is in Class B, C, or D airspaces.