So I went to plug in my external hard drive and I noticed the port was set back and then I popped the top of it and it's fully disconnected. I'm not familiar with computer hardware and was looking for guidance.
Like the name says. It's an enclosure for the HDD. The external HDD you use is actually an HDD (the one inside the computer) within an enclosure. The enclosure is just a container to provide power and the connection interface for external use.