SKU
A SKU (stock keeping unit) is a unique identifier for each distinct product variant in an inventory or catalog system.
SKU (pronounced "skew") is a unique product identifier. Every combination of product, size, finish, and any other variable is its own SKU. A single "Cotton Rag Matte Print" might have a dozen SKUs — one for each size — and each size might further split by frame color.
SKUs are the backbone of inventory systems, order tracking, and fulfillment workflows. They're also how customer service reps find your specific order in their system.
For print-on-demand businesses, SKUs can balloon quickly: 12 sizes × 4 frame colors × 3 paper types = 144 SKUs per design. Thoughtful SKU structure matters for operational sanity.
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