A:Answer The previous answer is misleading. The ports on either side of the HDMI port are a USB-C and a USB 3.0. USB-C ports happen to come in several (confusing) varieties; the one here has a "DP" symbol next to it, and has DisplayPort capability, even though physically, it's not a DisplayPort- or Mini DisplayPort-shaped port. (Does that clear things up? lol) So, with the right cable or adapter, you can use this USB-C port for DisplayPort functionality.
Not that you asked, but it should also be noted that this USB-C port uses the USB 3.0 standard and speed (aka SuperSpeed, aka USB 3.1 Gen 1, to add to the confusion), which is 5 Gbps, as opposed to USB-C ports with the faster USB 3.1 Gen 2 standard (aka SuperSpeed Plus), which can transfer data at 10 Gbps. The most advanced USB-C ports, in addition to having USB 3.1 Gen 2, also have Thunderbolt 3 capability, which allows for 40 Gbps data transfer speeds.
Given all these confusing variations, it would be great if you could easily look up the specific capabilities of a certain model's USB-C port. But you can't. The closest thing to documentation for this particular model is here:
http://www.dell.com/support/manuals/us/en/19/inspiron-15-7579-2-in-1-laptop/inspiron-15-7579-Setup-Specifications/Left?guid=GUID-BE17E2B5-6071-41F6-854D-E5F526405FA1&lang=en-us
(See screenshot if web address gets blocked.)
