People don't buy products, they 'hire' them to make progress in a specific situation, the famous milkshake was hired to make a boring commute bearable, not because it was tasty. Find the job, and you understand why people switch, what they compare you to, and what would make them fire you.
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The primary-source telling of the milkshake story, the single most memorable illustration of Jobs to Be Done, straight from Christensen and HBS. The best on-ramp to JTBD.
This is the canonical piece that put jobs to be done on the map, written by the people who coined it. It uses the famous milkshake story to show that customers do not buy products, they hire them to make progress in a specific situation, which is the exact lens this question is about. Read it as the clearest short starting point before going deeper into JTBD.