Application segmentation of the Graded-index Plastic Optical Fiber (GI-POF) market delineates five primary end‑use domains, each driving distinct demand dynamics. Automotive lighting accounts for roughly 35 % of total revenue, propelled by the shift toward high‑efficiency LED headlamps and interior illumination where GI‑POF’s low attenuation and bend tolerance reduce wiring complexity. Data communication follows with an estimated 30 % share, reflecting the fiber’s suitability for short‑reach Ethernet, automotive Ethernet, and in‑vehicle infotainment networks that require cost‑effective, high‑bandwidth links. Consumer electronics represent about 15 % of the market, underpinned by GI‑POF’s lightweight profile in wearable devices, VR headsets, and home‑automation sensors. Industrial automation contributes near 10 %, driven by the need for robust, flexible links in robotics, factory‑floor monitoring, and predictive‑maintenance systems where electromagnetic immunity is critical. Finally, medical devices also capture roughly 10 %, as GI‑POF enables minimally invasive diagnostic tools and patient‑monitoring cables that benefit from biocompatibility and sterilization resilience. This Graded-index Plastic Optical Fiber(GI-POF) segmentation framework quantifies how each application underpins overall market size.