These occur without the knowledge of a user. A user must simply visit an infected website to trigger the malware download. Hackers continuously attack legitimate websites to inject malicious code. Then, when a user browses that legitimate website (not knowing that it was compromised), the injected code is loaded by their browser automatically, resulting in infection.
Best site security I have found.
Steve Popz May
Trustpilotit works- I used to have stuff happen about twice a year- uardio warns me any time something looks fishy
John Robert Fleming
FacebookClick Bait
It's good to know that some of the click bait which gets my attention is connected to a sketchy web site. I need the re-affirmation that I have ignored my common sense
Jim Capillo
Trustpilot