Plain English Meaning
It's a marked 'tunnel' of regular airspace cut through the middle of busy Class B airspace, so VFR pilots can fly straight through without having to talk to air traffic control or get permission.
Full Definition
A VFR corridor is a defined airspace passage that extends through Class B airspace, with specific vertical and lateral boundaries, allowing aircraft to transit the area under visual flight rules without an ATC clearance and without establishing communication with ATC.
Context Anchor
Seen on VFR charts and in chart supplements for busy airport areas where published VFR routes help pilots pass through or around .