What is a physical or logical device used to capture keystrokes?

A physical device used to capture keystrokes is known as a keylogger, which can be a hardware component connected between a keyboard and a computer or embedded within a computer system. A logical device, on the other hand, refers to software-based keyloggers that operate in the background, recording keystrokes without the user's knowledge. Both types are often used for monitoring and surveillance purposes but can also be associated with malicious activities.