What does the term "digital" refer to in computer systems?

The term "digital" in computer systems specifically refers to the binary number system, which utilizes ones and zeros to represent and process data. This binary representation is fundamental to how computers operate, as it aligns with the on/off states of electrical signals in circuits. Each bit in a digital system can be either a one (on) or a zero (off), making it a highly efficient way to encode information.

In contrast, the decimal system, while it is commonly used by humans for everyday counting, is not the basis for digital computing. Analog systems, which can have continuous values and represent data in a more fluid manner, differ greatly from digital systems that function with discrete values. Lastly, while digital systems do use electricity, merely using electricity is not a defining characteristic of digital systems specifically; analog systems also rely on electrical signals. Therefore, the correct interpretation of "digital" directly relates to the binary number system of ones and zeros.