In a computer, a summation of digits or bits summed according to an arbitrary set of rules and primarily used for checking purposes. Typically used as an error detection technique in communication and data storage.

Entry at the end of the block of data corresponding to the binary sum of all information in the block. Used to error-checking procedures.

A value which is the arithmetic sum of all bytes in a program or program segment. As the program is loaded, the loader computes the sum of all bytes and compares the result with the checksum. If the two values are equal, it is assumed that the program segment was loaded without error.