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It does a fine job of detecting malware, does so without adversely impacting system performance, and does so without nagging you for renewals, upgrades, or up-sells. In the past tools have differentiated between classes of malware such as viruses and spyware.
You would need a separate utility for each: one anti-virus program, and another anti-spyware.
Various forms of advertising, including additional toolbars, homepage hacks, and data insertion (while technically not a form of spying) are often also included in the term to determine the presence of spyware.
Virus detection is more typically data-based, looking for specific patters of data that indicate the presence of a virus.
While “up there” is so exceptionally vague as to be meaningless, it does at least imply a difference in altitude: the device in front of you sits, conceptually, lower than remote servers or services on the internet.
Thus data is copied “down” from those servers to your machine.
Like Malwarebytes, it has also expanded to be a more fully-featured anti-malware tool.
Its job is to block malicious or unauthorized network traffic from crossing the firewall into a protected network.
The most common examples of a firewall are most consumer and small-business routers.
Also like a human virus, a computer virus replicates itself.
Just as you can copy a file from one disk to another and have copies on both disks, a computer virus is in part defined by its ability to make copies of itself.I used it for many years myself back in its anti-spyware days.