Two Trojan horses.
3 phishing websites
4 Malware
5. Leakage caused by system vulnerabilities
6. Leaks caused by irregular online habits, such as QQ, web pages, etc. I didn't close the door when I got off the plane at the Internet cafe! Browse the web at home, etc!
7 malicious invasion, hackers invade your computer and steal information!
8 Leaks caused by malicious information stealing by junk software were once turbulent!
There are many more! ! !