Final answer:
The Next Header field in an IPv6 packet determines the type of information following the basic IPv6 header, indicating which protocol to use for interpreting subsequent packet data.
Step-by-step explanation:
The field that determines the type of information that follows the basic IPv6 header is known as the Next Header field. This field provides the protocol of the next header in the packet, which informs the receiver how to interpret the data that follows the IPv6 header. In IPv6, this field is essential for the chaining of headers that include options, routing headers, and others. It is important for determining how the packet is processed by routers and the destination host.