验证码（Verification Code）主要用于以下目的。
1、验证用户身份：确保操作是由真实的人进行，而非机器或自动化软件。
2、防止恶意攻击：如防止机器人或恶意软件大量注册账号、刷票等。
3、提高安全性：在登录、注册、修改密码等操作时，增加额外的安全层，防止未经授权的访问。
In English, verification code is mainly used for the following purposes:
1、To verify user identity: Ensure that the operation is performed by a real person, not a machine or automated software.
2、To prevent malicious attacks: Prevent robots or malware from mass account registration, ticket brushing, etc.
3、To enhance security: Add an additional layer of security in operations such as login, registration, and password change to prevent unauthorized access.
