The purpose of parents' work certificates is to prove the employment status and position of parents, and is usually used in the following aspects: 1. Children's admission application: Some schools or educational institutions may require parents' work certificates as part of their children's admission application to ensure that the family has sufficient financial support to pay tuition and other expenses. 2. Children's scholarship or grant application: Some scholarships or grants require parents' work certificates to determine the family's economic status and financial needs. 3. Proof of residence: In some countries or regions, parents' work certificates may be used as proof of residence to prove that they have a stable income to pay rent or mortgage. 4. Reimbursement of medical expenses: If the parents' work provides medical insurance, then the medical institution may need parents' work certificates to confirm their beneficiary qualifications in order to reimburse medical expenses. 5. Visa application: Visa applications in some countries or regions may require parents' work certificates to prove that they have stable employment and a fixed place of residence.