Unsigned integers are a type of integer data type that can only represent non-negative whole numbers (positive numbers and zero). They are represented using a fixed number of bits, typically 8, 16, 32, or 64 bits, depending on the computer architecture and the programming language.
Unlike signed integers, unsigned integers do not use a sign bit to indicate the sign of the integer value. Instead, all bits are used to represent the magnitude of the integer value. This allows unsigned integers to represent a wider range of positive values than signed integers, as they can represent values between 0 to 2^n - 1, where n is the number of bits used to represent the integer.
In programming languages, unsigned integers are usually represented using data types such as "unsigned int" or "unsigned short int". The size of the data type determines the number of bits used to represent the integer and the range of values that can be represented.
It's important to note that unsigned integers are typically used when it's known that the values will always be positive and there is a need for a wider range of values than what is possible with signed integers. In other cases, signed integers may be a more appropriate choice.