is a security tool that detects and protects a personal computer and its data from unauthorized intrusions

protects a computer against viruses by identifying and removing any computer viruses found in memory, on storage media, or on incoming files

is a program placed on a computer or mobile device without the user’s knowledge that secretly collects information about the user and then communicates the information it collects to some outside sour

is a program that displays an online advertisement in a banner or pop-up window on webpages, email messages, or other Internet services