What is the code?

In the modern world very often we meet with codes when performing various operations. What is a code?

A code is a specific combination of symbols, which is auxiliary to understanding a message or to perform an action.

Codes can consist of numbers, letters, signs, sounds. What does each code mean? Consider the most popular types of codes.

Code as an algorithm

It is concluded in a certain sequence of actions for the commission or confirmation of an operation.

Genetic code

This is a specific sequence of nucleotides in DNA and RNA chains in living organisms. With its help, the hereditary information of each individual is recorded.

Pin

It stands for "personalIdentification number "is a digital signature analogue used for accessing cash cards - credit or SIM cards. Read more about this in the article What is a card code.

Barcode

This information in the form of strokes, applied to the packaging of the goods, so that it can be read by special devices during the sale.

QR Code

In short, this is an improved version of the barcode. Only created in a matrix, in two-dimensional space. More information about this type of encoding you can read in the article What is QR-code.

CVV and CVC code

This is a code consisting of three digits and indicated on the back of the bank card. Used to confirm payments when paying by card without contacting the payment terminal, for example, via the Internet.

Machine code

A command system for a particular type of computer that provides its operation.

Bytecode

One of the simple kinds of machine code that performs simple operations.

Shell code

Computer code that transfers control of the computer from the user to the command processor. Often used by hackers.

Code as a cipher

Allows using a specific character setencode an information message. Here, each character has its own character set. A vivid example is the Morse code, where each letter corresponds to a certain signal.

The method of coding information is selected in each case individually depending on its purpose.

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