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''Data alignment'' is the aligning of elements according to their natural alignment. To ensure natural alignment, it may be necessary to insert some ''padding'' between structure elements or after the last element of a structure. For example, on a 32-bit machine, a data structure containing a 16-bit value followed by a 32-bit value could have 16 bits of ''padding'' between the 16-bit value and the 32-bit value to align the 32-bit value on a 32-bit boundary. Alternatively, one can ''pack'' the structure, omitting the padding, which may lead to slower access, but uses three quarters as much memory.
Although data structure alignment is a fundamental issue for all modern computers, many computer languages and computer language implementations handle data alignment automatically. [[Fortran]], [[Ada (programming language)|Ada]],<ref>{{cite book
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