Dell Inspiron 11 (3147, Mid 2014) - Manual (Page 65)

S/PDIF
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Micro HDMI
Micro High Definition Multimedia Interface (HDMI) provides digital
connection between your computer and portable devices such as smart
phones, notebooks, and so on. This connector resembles the micro‑USB
connector found on most smart phones.
S/PDIF
S/PDIF is a standard for transferring audio in digital format. You can use
S/PDIF to audio devices such as sound cards, speakers, home theater
systems, TVs, and so on. It provides 5.1 audio support.
There are two kinds of S/PDIF connections:
• Optical — Uses optical fiber with TOSLINK connectors
• Coaxial — Uses coaxial cable with RCA connectors