What IPv6 prefix is reserved for communication between devices on the same link?

The IPv6 prefix reserved for communication between devices on the same link is the link-local address prefix, which is FE80::/10. This range includes addresses from FE80:: to FEBF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF. Link-local addresses are used for network communication within the local subnet and are automatically configured on IPv6-enabled interfaces.