HomeTechnologyCybersecurityWhat is Trojan?
Technology·2 min·Updated Mar 9, 2026

What is Trojan?

Trojan Horse

Quick Answer

A Trojan is a type of malicious software that disguises itself as a legitimate program to trick users into downloading and installing it. Once activated, it can perform harmful actions without the user's knowledge, such as stealing personal information or compromising system security.

Overview

A Trojan is often hidden within seemingly harmless software, like games or applications, making it difficult for users to recognize its true nature. When a user installs the Trojan, it can create a backdoor for hackers, allowing them to access the computer remotely. This can lead to a range of issues, from data theft to complete control of the infected device. One common example of a Trojan is a fake antivirus program that claims to protect your computer but actually infects it with malware. Users may be lured into downloading it because it appears legitimate and offers a solution to perceived threats. Once installed, the Trojan can gather sensitive information, such as passwords and credit card numbers, and send it to cybercriminals. Understanding Trojans is crucial in the field of cybersecurity because they represent a significant risk to individuals and organizations alike. By being aware of how Trojans operate and the tactics they use to deceive users, people can take better precautions to protect their devices and personal information from these malicious attacks.


Frequently Asked Questions

Signs of a Trojan infection include slow performance, unexpected crashes, and unfamiliar programs running on your computer. You may also notice unusual behavior, such as changes to your browser settings or frequent pop-up ads.
If you suspect a Trojan infection, immediately disconnect from the internet to prevent further damage. Then, run a full scan with a reputable antivirus program to detect and remove the Trojan.
Yes, you can reduce the risk of Trojans by keeping your software up to date, using strong passwords, and being cautious about downloading programs from untrusted sources. Additionally, installing and regularly updating antivirus software can provide an extra layer of protection.