[StilesCrisis]

This is actually a good analogy; the beer cans are self-contained and ready for the customer with zero extra work. The beer delivered by the tanker still needs to be poured into individual glasses by the bartender, which is slow and tedious.

[cake-rusk]

He probably meant beer kegs. Memory map-able data is closer to sending beer cans since both are in a ready to use format.