Is Trojan a Virus or Malware?

Is Trojan a Virus? : 

Not at all.  Most of us think that Trojan Horse is a kind of computer virus but Trojan is not a virus...

Then What is Trojan? :

A trojan is a type of malicious computer program or malware, which looks like a normal program.

Its secretly hide, steal important computer information, or create a computer security backdoor and sometimes takes full control of the computer.

For example, there are many memory cleaners, which when clicked on, it seems that your memory has been cleaned.  But in fact, the memory becomes more jammed.  Trojans can also be seen in various antivirus, speed booster.  You will feel that your memory will be clean or the speed of the computer will be boosted.  But once this thing enters your computer it will show up in its original form, and your system will start to slow down.  And they will not only slow down the speed of your computer but also pave the way for various viruses, worms, and malware to enter your computer...

...No More Today...