keylogger
noun
key·log·ger
ˈkē-ˌlȯ-gər
-ˌlä-
: a piece of software that records the signals sent from a keyboard to a computer usually for the purpose of gaining information about the user without the user's knowledge
Malware works most commonly by installing a keylogger or some other form of spyware that watches what you type or see.—Mat Honan
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Merriam-Webster unabridged
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