### Comment:
How can hackers gain unauthorized access to computer systems?

### REPLY:
Hackers can gain unauthorized access to computer systems through various methods. One common technique is by exploiting weak or default passwords, especially those used by administrators. They can also take advantage of unpatched vulnerabilities in operating systems or software applications. Another method is by using keyloggers or remote access tools to steal login credentials or gain control over the system. However, engaging in hacking activities is illegal and can lead to severe consequences.