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Cash Account: The basic type of Hong Kong/U.S. stock securities account, referring to a securities account where investors only trade securities with their own funds, cannot use broker financing leverage, and cannot short sell. All buy actions in the account must be based on sufficient available funds, and proceeds from sales can only be reused or withdrawn after settlement is completed. Tax Country: Precisely stated as the "jurisdiction of tax residence," referring to the country/region where an investor is deemed a tax resident under local tax laws and bears comprehensive tax obligations. It is the core determination basis under the CRS (Common Reporting Standard) and FATCA (Foreign Account Tax Compliance Act), and has no necessary correspondence with the investor's nationality or account opening location. Tax ID Number: A unique identification number assigned by tax authorities in each jurisdiction to taxpayers, used for tax filing, tax withholding, and information verification. It is the core credential for verifying tax resident identity and a mandatory field that financial institutions must collect when opening accounts under the CRS/FATCA framework. KYC (Know Your Customer): A mandatory identity verification compliance process in the financial industry. Institutions strictly verify real ID documents, residential address, occupational background, investment qualifications, and other information during the account opening stage, complete real-name filing and identity determination, and prevent violations such as anonymous account opening and identity fraud at the source. AML (Anti-Money Laundering): Covers control requirements related to combating terrorist financing. Institutions use a complete set of risk control mechanisms such as customer risk classification, fund flow tracing, large and abnormal transaction monitoring, and suspicious transaction reporting to prevent illegal activities such as money laundering, illegal cross-border fund transfers, and financial fraud. CDD (Customer Due Diligence): A core review process in financial compliance and the key component of KYC implementation. It refers to financial institutions verifying the customer's true identity, residential address, background investigation, confirming source of funds and transaction purpose throughout the account opening and business cooperation process, classifying customer risk levels, and meeting mandatory AML compliance requirements of local regulators.