Binary code is a system of representing data and instructions in computers using only two symbols: 0 and 1. These two symbols are called binary digits, or bits for short, and they form the basis of all digital communication and computation.
Each binary digit represents a single electrical charge or voltage in a computer's memory, with 0 representing no charge and 1 representing a charge. By arranging these binary digits in a specific pattern, computers can encode and store data and instructions, including numbers, letters, images, and sound.
In a computer's memory, binary code is organized into larger units, such as bytes or words, with each unit containing a specific number of bits. For example, a byte typically contains 8 bits, and a word typically contains multiple bytes.
The binary code used in computers can be translated into human-readable text and images by using specific programs and protocols. For example, a program called an interpreter can translate binary code into a programming language that humans can understand, such as Python or Java.
The use of binary code has revolutionized the way we interact with computers and has made it possible for computers to process and store vast amounts of data and information. Additionally, the simplicity and universality of binary code makes it easy for computers to communicate with each other, regardless of the type or model of the computer.
 

Morse code: Morse code is a system of communication that uses a series of dots and dashes to represent letters and numbers. Each letter is represented by a unique combination of dots and dashes, which can be transmitted as audio signals or visual flashes of light. Morse code is still used in some contexts today, such as in amateur radio communications and by pilots to communicate with air traffic controllers.
ASCII code: ASCII (American Standard Code for Information Interchange) is a character encoding system that assigns a unique numerical value to each character in the English language, as well as to a variety of punctuation marks and other symbols. For example, the letter "A" is represented by the numerical value 65, and the letter "a" is represented by the numerical value 97. ASCII code is used extensively in computer systems to represent text data.
DNA code: DNA (deoxyribonucleic acid) is the genetic material that encodes the instructions for the development and function of all living organisms. The code that underlies DNA is similar in some ways to binary code, in that it uses a four-letter "alphabet" (A, C, G, and T) to represent the genetic information contained in a DNA molecule. Each "letter" in the DNA code represents a specific nucleotide, which in turn determines the sequence of amino acids in a protein.

Binary code can be compared to a secret code used by computers. Just as a secret code uses a series of symbols or numbers to represent information, binary code uses a series of 0s and 1s to represent information. Just as a secret code might be decoded to reveal a message, binary code is decoded by computers to reveal instructions or data. And just as different symbols or numbers in a secret code can represent different letters, words, or instructions, different combinations of 0s and 1s in binary code can represent different letters, numbers, or instructions for the computer to follow. In short, binary code can be thought of as a secret code used by computers to represent information and instructions.