The role of the MD5 algorithm does not include the following three aspects:

1. The MD5 algorithm cannot guarantee the absolute security of data. It can only improve the security of data, but it cannot completely avoid it. Data leakage or attack.

2. The MD5 algorithm cannot replace other security measures, such as firewalls, access control, encrypted transmission and other measures.

3. The MD5 algorithm may have certain security vulnerabilities, such as collision attacks, etc., and it needs to be combined with other security technologies for comprehensive application.

The MD5 algorithm is a commonly used hash algorithm, mainly used for data integrity verification and digital signatures.