Is it Spam? Is it Phishing? Cybercriminals have become quite savvy in their attempts to lure people in and get you to click on a link or open an attachment. A malicious email can look just like it comes from a financial institution, an e-commerce site, a government agency or other business. It often urges you to act quickly (account compromised!, order can't be fulfilled) or some other urgent or scary matter to address. Or could just be annoying ads you'd rather not see.