Qualcomm's massive Snapdragon chip empire could be under threat with Arm Holdings PLC killing their partnership with the firm.

Any company that makes Arm chips must license technology from Arm Holdings plc, the British company that develops the instruction set. Companies can license the instruction set and create their own CPU designs or license one of Arm's ready-made Cortex CPU core designs to incorporate into their own chips.

ARM and Qualcomm find themselves in a legal tussle over a licensing issue, here's why its important for the smartphone industry.