Final answer:
The void keyword indicates that a function declared with it does not return any value to the caller. The correct answer to complete the sentence is 'void'. This is used in functions that perform actions without needing to return data.
Step-by-step explanation:
The void keyword in programming, particularly in languages like C and C++, is used in function declarations to specify that the function does not return a value to the caller. When a function is declared with a void return type, it means that after the function completes its execution, it does not pass any data back to the function from which it was called. This is used for functions that accomplish tasks without the need to communicate a result back to the calling function.
Based on the options provided with the question, the correct completion is: The void keyword is used only in function declarations. It indicates that the function is expected to return no information to the function from which it was called void.