TROJAN
Trojans or Trojan Horses are programs that appear to be innocuous even beneficial, but in fact, are harmful!. Much like the historical trojan horse, these programs appear favorable to you but in reality make your system more vulnerable to attacks and malware. The harmful contents could be anything from a virus to a remote pc or server. Trojans are designed to cause loss or theft of data, and or system destruction. Trojans can be distributed as email attachments, or bundled with other software programs.
BACKDOOR
a means of access to a computer program that bypasses security mechanisms. A programmer may sometimes install a back door so that the program can be accessed for troubleshooting or other purposes, but an attacker may exploit or use a back door to get unauthorized access to information or install spyware.
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