Int is the abbreviation of integer, which means a whole number or an integral number. It is one of the basic data types in programming language, used to indicate the data type of variables and for the forced data type conversion of constants. The length and range of integer data are not fixed and are influenced by the compilation environment. When declaring this type in different programming languages, the specific implementation may also vary. Int also refers to the INT function, which is a commonly used function in databases for rounding down. It is often used to extract the integer part of a number by rounding it down to the nearest whole number.