Final answer:
A malware that activates on certain conditions, like a specific date and time, is called a logic bomb. It remains dormant until triggered, potentially causing harm like data destruction.
Step-by-step explanation:
The type of malware that delivers its payload only after certain conditions are met, such as a specific date and time, is known as a logic bomb. Unlike other types of malware that typically activate as soon as they can, a logic bomb lies dormant until a predefined trigger occurs, which could be a particular date, time, or another condition. For example, a programmer might plant a logic bomb in a company's software that will execute when they are no longer employed by the company, launching a malicious action such as destroying data.