What does the second hexadecimal digit represent when calculating hexadecimal values?

In the context of hexadecimal values, each digit represents a series of binary digits (bits), with each hexadecimal digit corresponding to a 4-bit binary representation.

When discussing the second hexadecimal digit specifically, it serves as the high-order nibble when combined with the first digit. The first digit of a two-digit hexadecimal number represents the most significant part of the byte, while the second digit represents the least significant part.

For example, in the hexadecimal value "2A", the '2' is the high-order nibble (contributing to the higher value of the byte), and 'A' (which is 10 in decimal) is the low-order nibble, contributing to the lower value. Therefore, the second hexadecimal digit contributes to the low-order part of the byte when viewing the overall value in base 16.

The options referring to byte and bit do not accurately capture the significance of the second hexadecimal digit in relation to the overall value, making it clear that the correct choice deals specifically with the nibbles, indicating the specific place value of the digits within a hexadecimal structure.