Which type of software enables someone to secretly obtain information from someone's hard drive?

Spyware is a type of software specifically designed to monitor and collect information from an individual's computer without their consent. It operates discreetly in the background, often without the user's awareness, and can gather a variety of data, such as browsing habits, personal information, and login credentials. This software is typically used by malicious parties to intrude on privacy and may also serve as a means for identity theft or unauthorized access to sensitive information.

In contrast, anti-virus software is primarily focused on detecting and removing malware, such as viruses and trojans, to protect systems. Firmware refers to the low-level software programmed into hardware devices and does not function as a monitoring tool. Plugins are add-ons that enhance the functionality of applications, mainly web browsers, rather than secretly acquiring information. These distinctions emphasize the unique role that spyware plays in the realm of data surveillance.