CAID is a surveillance technology developed by the China Advertising Association to circumvent web tracking restrictions set by Apple. CAID was developed by the state-supported, 2,000-member association to identify users when Apple's Identifier for Advertisers ("IDFA") is unavailable. Besides a free demo, the technology was unimplemented as of March 2021 and Apple was aware but had yet to address the effort. Public release was unannounced but anticipated later in the month.