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Backdoor is a secret or unauthorized channel for accessing computer system.
A backdoor typically works by allowing someone or something with knowledge of it to use a special password(s) and/or other actions to bypass the normal authentication (e.g., user name and password) procedure on a remote machine (i.e., a computer located elsewhere on the Internet or other network) to gain access to the all-powerful root (i.e., administrative) account. It is designed to remain hidden to casual, or even careful, inspection.

Backdoors can be planted into computers in any of several ways.

(1) One is by inserting them into the source code of otherwise legitimate software, i.e., an operating systems or an application program. This can be done intentionally by the company that develops the software, by one or more employees of the company without knowledge of the management, or by outsiders who secretly gain access to the software while it is being developed or updated.

(2) Second is through the use of viruses, worms or other malware (i.e., malicious software) that are specifically developed for the purpose of planting backdoors. This malware can gain access to a computer in any of numerous ways, including through the opening of infected e-mail attachments, the downloading of files from the Internet, or merely visiting certain web sites.

(3) Third is by hiding them in an algorithm that is used in programs. An algorithm is a set of unambiguous rules that specify how to solve some problem or perform some task. Algorithms are fundamental to the operation of software, and a single infected algorithm could be used in a number of programs.

(4) Fourth is to modify a compiler so that it recognizes a short segment of code in source code during compilation that causes it to insert a backdoor in the compiled output. A compiler is a specialized computer program that converts source code into machine language so that its instructions can be understood by computers' central processing units (CPUs).