Learn in the textbookPractical Methods for Idea Generation and Validation
DefinitionPoC (Proof of Concept, 概念実証) is verification that, before a new idea or technology is fully developed, tests it on a small scale to confirm that it actually works.
ExplanationIf you commit a large budget right away, the loss is heavy when you find out after starting that the method does not work. So you first judge feasibility, such as whether it works technically and gives the expected effect, through a narrowly scoped prototype or trial. Based on the results, you decide whether to move to full development, revise the plan, or drop it.
AnalogyIt is like trying a new building method you are curious about on a small shed before building the house, to see whether it really keeps the rain out.
Memory hookThe C stands for Concept (an idea or plan), so the name reads as "proof that the idea holds up".