system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 how does Amazon go from 2 day shipping to 1 day shipping?

It seems like such a huge jump. How do you cut your industry leading delivery times in half? It's one thing to send a package in 1 day, it seems crazy to ship a random assortment of 1 million packages all in 1 day.
gpt
It really comes down to where they have warehouses . Storing the items close to where people are so that when something gets ordered it's really just gonna ship from somewhere close by. Amazon has been devloping their network of warehouses aka the fulfillment centers specifically for this purpose.