Final answer:
A program advertised as doing one thing but actually doing something else is known as a Trojan Horse. It disguises itself as legitimate software but carries out malicious activities once installed.
Step-by-step explanation:
A program that is advertised as performing one activity but actually does something else is known as a Trojan Horse. Hackers design Trojan Horses to appear harmless or useful to entice users to download and install them. Once activated, they can perform a variety of malicious actions such as stealing data, spying on user activities, or installing other harmful software.
While Spyware covertly collects information about a user without their knowledge, a Worm is a standalone malware that replicates itself to spread to other computers. Phishing is a tactic used to deceive individuals into providing sensitive information, such as login credentials or credit card numbers, by masquerading as a trustworthy entity in an electronic communication.