A certificate of deposit is a document issued by a bank to prove that the applicant has a certain amount of deposit in the bank account. The main uses of a certificate of deposit are as follows: 1. Applying for a visa: Many countries require applicants to provide proof of financial funds during the visa application process to prove that they have sufficient financial ability to pay for travel expenses and living expenses in the destination country. A certificate of deposit can be used as a valid document for this proof of financial funds. 2. Study abroad application: Some study abroad applications require financial guarantee materials to prove that the applicant has sufficient funds to pay for tuition, living expenses, etc. during their study abroad. A certificate of deposit can be used as part of the financial guarantee materials to prove that the applicant has sufficient deposits. 3. Proof of residence: In some countries or regions, such as renting or buying a house, it is necessary to prove that the applicant has sufficient funds to pay the rent or purchase price. A certificate of deposit can be used as a valid document for this proof of funds. 4. Taking an exam: Some exams (such as overseas physician qualification exams) require applicants to provide a certain amount of deposit certificates to prove that they have the financial strength to take the exam. It should be noted that the requirements and uses of proof of deposit may vary depending on factors such as country, region, visa type, etc. Applicants should carefully read the relevant requirements before going through the procedures to determine whether proof of deposit is required, as well as specific requirements such as the amount and format to be provided.