The Byte is a digital information unit equivalent to eight bits. Each byte represents a single text character on a computer. A byte can represent a letter, a symbol, a number or a punctuation mark. The byte is used to specify the size or amount of memory or the storage capacity of a device. Some programming languages use the term byte to represent an integer-type variable, which takes up less space than other similar numeric variables. Something similar also occurs in the vast majority of databases. Because storage space is very important, sometimes when you want to store an integer, you should get an idea of the size of that number. For example, if we want to store the age of a person we will not need such large numbers as to save the balance of our bank account, which in some cases can reach several digits.
The Bit is the basic unit of digital information used in electronic media. Bit stands for Binary Digits, because they only contain two values: one and zero. All information processed by a computer is encoded in bits. The same applies to the size of the files we store. Telecommunications and the volume of traffic in computer networks are also generally accounted for in terms of bits per second. The notation for bit uses a lowercase "b", whereas the notation for byte uses a capital "B". The term bit in addition to what has already been mentioned, serves to classify the number of colors of an image. For example, a monochrome image has a one color bit, because we only need to distinguish black from white. An 8-bit image supports 256 different colors, but still remains a small number when it comes to photography. In this field the most common is to work with images of at least 24 bits, which represents a quite acceptable number of colors. Computer systems are also distinguished by being 32-bit or 64-bit system. This difference is related to the number of bits that the processors can process simultaneously.