Cybersecurity threats and vulnerabilities are two distinct concepts in the realm of computer security. A cybersecurity threat is a potential danger or harm that could result from an intentional or unintentional act that targets a computer system or network. Examples of cybersecurity threats include malware, phishing attacks, ransomware, denial-of-service (DoS) attacks, and data breaches. 

On the other hand, a vulnerability is a weakness or gap in the security of a computer system that a threat can exploit. Vulnerabilities can be the result of programming errors, misconfigured systems, or outdated software. Examples of vulnerabilities include unpatched software, weak passwords, open network ports, and misconfigured firewalls. 

To prevent cybersecurity threats and vulnerabilities in computer systems, several steps can be taken, including: 

1. Regularly updating software and systems to fix security vulnerabilities. 
2. Using strong and unique passwords for all accounts and implementing multi-factor authentication.
3. Training employees on cybersecurity best practices, such as not clicking on suspicious links or downloading unknown files. 
4. Installing and maintaining anti-virus and anti-malware software. 
5. Implementing firewalls and other security measures to protect against network attacks. 
6. Regularly backing up important data and storing it in a secure location. 
7. Conducting regular security assessments and penetration testing to identify and address vulnerabilities. 

By taking these and other measures, organizations can significantly reduce the risk of cybersecurity threats and vulnerabilities in their computer systems.