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Data alignment in C++ determines how variables are positioned in memory to optimize CPU access. The compiler automatically inserts padding bytes between structure fields to ensure each element aligns to addresses divisible by its size, preventing performance penalties from split memory reads. Understanding alignment rules—including natural alignment, structure padding, bit fields, and tools like alignas/alignof—enables developers to optimize memory layout by reordering fields, reduce structure sizes, and avoid undefined behavior from unaligned pointer casts. Static analyzers like PVS-Studio can detect alignment-related issues including suboptimal field ordering and dangerous pointer conversions.