system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does Apple keep changing their ports?

There doesn't seem to be a specific, clear reason. Why should they change it?
gpt
If you're referring to the new Macbook, that port is a USB type-C port, it's an international standard, and you're going to start seeing that port on pretty much everything. Google has already announced that the new Chromebook Pixel is using it.

The port is reversible (which is always nice), is faster, and lets you draw more power (useful for charging) than other ports.