About this question
I've been doing some trailhead and there was a paragraph:
"Meet Sally, Gunjan, and Ali. These three amazing developers are working on an exciting new Salesforce app, and tomorrow is the big launch day. Sally and Gunjan have been working in developer orgs, and Ali in a sandbox org. Sally creates an unmanaged package and pushes it to the sandbox org. Gunjan does the same. What could go wrong?"
This got me confused, because there are these types of sandboxes:
Developer Sandbox
Developer Pro Sandbox
Partial Copy Sandbox
Full Sandbox
What's the difference between developer org and sandbox org?