Just as different types of software perform different functions, so different types of malware can perform different jobs, whether they make themselves apparent or run on your device while hiding in the background. Unlike the old days, when malware like viruses often announced themselves by displaying messages or by giving your computer the “blue screen of death,” many types of malware today can hide without producing any tell-tale symptoms of an infection. Some types of malware “announce” themselves, while others can hide on your device