Final answer:
A computer virus is a type of malicious software that can infect a computer system and disrupt its normal operation. It can cause symptoms such as slow performance, crashes, and data loss. Preventive measures include using reliable antivirus software, avoiding suspicious emails and downloads, and regularly backing up files.
Step-by-step explanation:
A computer virus is a type of malicious software that can infect a computer system and disrupt its normal operation. It is typically spread through email attachments, downloads from the internet, or infected files transferred from one computer to another.
Computer viruses can cause a range of symptoms, including slow performance, frequent crashes, pop-up ads, and loss of data. Some viruses may also take control of a computer and use it to spread to other devices.
To prevent computer viruses, it is important to take certain measures. First, always use reliable antivirus software and keep it up to date. Additionally, avoid opening suspicious emails or clicking on unknown links. It is also recommended to regularly backup important files and avoid downloading files from unknown sources.