Final answer:
The term 'empty input' describes when no input is provided. It can refer to a situation when the input is blank, null, or zero.
Step-by-step explanation:
The term 'empty input' describes when no input is provided. It can refer to a situation when the input is blank, null, or zero. In the context of programming, empty input refers to the absence of any valid data in an input field or variable.
For example, if a user is filling out a form and leaves a required field blank, it can be considered as empty input. Similarly, if a function expects a parameter but no value is passed to it, that would also be an empty input.
Overall, empty input signifies the lack of valid information or data in a given context.