On the internet there is every good thing to know. We can get every kind of information by watching videos, interacting with people worldwide. But there are dangers here. I'm going to explain to you every computer/smartphone virus, how to detect them and take precautions.
Malware (Malicious Software)
This type of virus comes along with a .exe file format. Without the user's consent, it's damaging the device slowly and breaking its performance. This virus comes from suspicious websites, emails, infected USB and social media chats. It could be downloaded without you can realize about it.
A little bit of History class. In the ancient Greek world, the Trojan horse was a gift from the warriors of that place to the Achaeans. But, when they fell asleep, the Trojan soldiers started a slaughter! This could exactly happen to your devices if you're not checking every downloadable file or sent files on chat. It's disguised as legit and secure software, but it could be a simple cute kitten photo with malicious intentions inside!

One of the most dangerous viruses. It encrypts all your important files and makes your device "kidnapped". It could be a really hard hit for you if you're studying or working, even for personal use, losing everything that you've saved. Attackers want you to recover your devices with BTC payment, but they don't really do that, actually. WannaCry is the perfect example of it.

This is a disturbing virus attack putting every unwanted advertisement on your device. Even when you're not doing anything, they come almost invading your screen, offering to you fake promotions just like winning Apple devices or other things. It also contains pornographic ads.

The stealthious virus attacks. As its name says, this virus spies everything you can do without your consent. They look at you from the camera, and they're watching everything you do. It comes disguised as a famous game and third-party software for something you're doing.

Programmed to be replicated so faster and exploiting a network vulnerability. It also makes the device performance so slow because it's using all the PC data to the limit, as well as network service.

Another stealth virus that it's hidden and extracting every thing typed on a keyboard. It's used to steal passwords and sensitive data.

They act like zombies for coordinated attacks like, DDoS or Spam, making crash down the servers.

You will not realize why your computer is so slow, doing tasks to the limit even when you're just exploring on the internet, playing a game or something. Yeah, crypto mining is just another bothering virus, and it's very stealth too. It puts the PC to work to 100%, making an uncomfortable and disturbing performance for the user.

This is the deepest malicious attack focused on mobiles or tablets. Gives all the access to the hacker on the victim's device remotely to spread his attacks to others.

Protecting us on the internet is so very important, we don't want to be blackmailed, molested or harassed when someone retrieves our sensitive data for something. Also, that they can damage our devices and only formatting is the only solution. That makes us delete all our important files (if we're studying or working). Stay updated every day, and check for more information on the internet about computer and smartphone security.