A headphone port refers to the place on a device, like a computer or phone, where you can plug in your headphones. It allows you to listen to audio without disturbing others around you. Full definition
The bottom plays host to the USB - C charging port, while you'll find a 3.5 mm headphone port on the top. (techradar.com)
There doesn't seem to be a 3.5 mm headphone port on the top or the bottom, so be prepared for that possibility. (xda-developers.com)
That's not much of a surprise in a budget phone, but you will definitely want to use the 3.5 mm headphone port for listening to music or enjoying movies. (techradar.com)