Definition: While not necessarily malware, adware is considered to go beyond the reasonable advertising that one might expect from freeware or shareware.
Typically a separate program that is installed at the same time as a shareware or similar program, adware will usually continue to generate advertising even when the user is not running the originally desired program.
Definition: A port scan is a series of messages sent by someone attempting to break into a computer to learn which computer network services, each associated with a "well-known" port number, the computer provides.
Port scanning, a favorite approach of computer cracker, gives the assailant an idea where to probe for weaknesses. Essentially, a port scan consists of sending a message to each port, one at a time.
The kind of response received indicates whether the port is used and can therefore be probed for weakness.
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