What are the difference between resident and non resident viruses?

Answer 1

A Nonresident is a computer virus that is not stored on the hard drive of the computer system. Rather, the virus makes a home in an executable file that infects a computer each time it is accessed and run.

While Resident viruses do not search for hosts when they are started. Instead, a resident virus loads itself into memory on execution time and transfers control to the host program.

Answer 2

Resident viruses remain in the computer's memory even after the host program is terminated, whereas non-resident viruses do not stay in memory and instead operate by executing their code and spreading to other files. Resident viruses can be more difficult to detect and remove since they are constantly active in the computer's memory, while non-resident viruses only execute when an infected file is opened or executed.