What is a characteristic of spyware?

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Spyware is a type of malicious software designed to secretly monitor and collect information from a user's computer without their consent. Its primary characteristic is its capability to gather personal data, which can include sensitive information like passwords, credit card details, and other identifying information. By accomplishing this, spyware can facilitate identity theft, making users vulnerable to fraud and unauthorized access to their financial or personal accounts.

The other options do not accurately capture the essence of what spyware does. For instance, spyware does not speed up a computer or improve system performance; rather, it typically slows down the system as it uses up resources to operate and collect data. Additionally, while some forms of tracking software can be used for ad targeting, spyware operates in a more covert and harmful manner, often without the user's knowledge, mainly causing security and privacy risks rather than benefits.