Qualcomm Incorporated is an American multinational semiconductor and telecommunications equipment company that designs and markets wireless telecommunications products and services. It derives most of its revenue from chipmaking and the bulk of its profit from patent licensing businesses. The company is headquartered in San Diego, California, United States, and has 224 locations worldwide. The parent company is Qualcomm Incorporated (Qualcomm), which has a number of wholly owned subsidiaries: Qualcomm CDMA Technologies (QCT) sells all of Qualcomm's products and services (including chipsets); Qualcomm Technology Licensing (QTL) is responsible for the patent licensing business; and Qualcomm Technologies, Inc. (QTI) operates nearly all of Qualcomm's R&D activities.