How to tell if your Mac has a virus

Apple products often come with an air of invincibility, and through the years, they’ve shown resistance to threats in ways Microsoft computers aren’t privy to. This, however, does not mean that Macs aren’t invulnerable.
Viruses that affect Macs
There are four general virus types that hit Apple products, and their effects can range from merely annoying to downright destructive:
Adware
Adware are unwanted programs that bombard users with pop-up advertisements.