What is the purpose of using data structure alignment in programming?

Data alignment in programming is used to optimize memory access and improve performance. The goal is to arrange data in memory so that they start at addresses that are multiples of their type size (for example, 4 bytes for int), which allows the processor to read and write data faster.

Without proper alignment, the processor may need to perform additional operations to read or write, reducing speed. Additionally, some architectures require alignment for correct operation, otherwise an error may occur.

Example: if a structure contains an int and a char, the compiler may add padding so that the next element starts at the correct address.