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Two-Factor Authentication (2FA) enhances account security through password plus verification code or biometric authentication, widely used in finance, government services, and other sectors, effectively preventing risks from password leaks.

Virus scanning is a technical method for detecting and removing computer viruses and malicious software, safeguarding system security through signature detection, heuristic analysis, and other methods.

TTL (Time To Live) is a key concept in computer networking and electronic engineering, widely used in network protocols, domain name systems, integrated circuits, and cache management.

垃圾邮件过滤是识别并拦截未经请求的广告、欺诈或恶意邮件的技术，保障电子邮件安全。

CNAME record is a resource record in DNS used to create domain aliases, widely applied in website hosting, CDN acceleration, and third-party service integration, enhancing domain management flexibility and efficiency.

PTR records are the key mechanism for implementing reverse DNS lookups in DNS, used to map IP addresses back to domain names, playing an important role in email verification, network security, and log analysis.

An A record is a basic record type in DNS that resolves domain names to IPv4 addresses, supporting website access, load balancing, failover, and other functions, serving as a key component of internet communication.

AAAA records are resource records in DNS used to resolve domain names to IPv6 addresses, forming an important part of IPv6 adoption.

CalDAV is a standard protocol based on WebDAV, used to implement cross-platform, cross-device calendar data synchronization and sharing, supporting event management, multi-user collaboration, permission control, and other functions, widely applied in mainstream calendar services.

DKIM Record is a key technology for email authentication that ensures the authenticity of email sources and integrity of content through digital signatures, enhancing email credibility, preventing forgery and tampering, and serving as an important means for enterprises to ensure email security.