Leak (what is this part?)

Also, all cars do it.
More noticeable on a jeep because they sit higher.

Mine does but since I’m driving it I know what I’ve done. She’s just a little nervous because her transmission lines blew a couple months ago so I needed to check everything to make sure so she knew she was good. I’m no mechanic but I’m a good researcher and you tuber so I get us by on most stuff.. Thanks for all the help
 
My daughter 98 Tj 4.0 is leaking. This part is under the hood, passenger side, coming from the cabin direction. Why would it be leaking from here? I don’t know enough to research until I can figure out what it is.
I asked the same question a month or so ago. Never fun finding a new "leak". Turned out to be exactly what these guys were saying, AC issue... or non issue