When using a computer, mobile, or any device connected to the network, there are many threats that we can find. There are many types of viruses, Trojans, and malware in general. Obviously not all act the same and it is important to know to what extent they can damage the operation of a computer, steal data or infect other devices on the network. In this article, we are going to talk about backdoor Trojans. We will see how they work and what to do to avoid them.