Summary: Back Contact (BC) technology, by relocating all electrodes to the rear side of the cell, completely eliminates front-side grid line shading. This unlocks the highest level of aesthetic uniformity for modules while opening new pathways for efficiency gains. The latest technical focus is on advanced laser patterning and precise back-surface passivation processes. By optimizing the micro-nano structural design of back electrodes and adopting more efficient conductive adhesive interconnection technologies, researchers are dedicated to further reducing series resistance and optical losses within the cell. Regarding development, this technology path is evolving toward a platform-based "BC+" approach that integrates with passivation contact technologies like TOPCon or HJT. This synergistic combination aims to maintain its core advantage of a grid-line-free appearance while incorporating the strengths of other technologies, pushing lab cell efficiencies toward new heights above 27%. Future challenges and R&D priorities involve simplifying the complex manufacturing process for the back-side structure, developing low-cost, high-precision alignment techniques, and implementing new low-cost metallization solutions to drive the adoption of this premium technology into broader markets.