| AD | Active Directory — Microsoft's directory service for Windows Server |
| API | Application Programming Interface — standard for software interaction |
| APNS | Apple Push Notification Service — Apple's push notification delivery system |
| FCM | Firebase Cloud Messaging — Google's cross-platform messaging service |
| JSON | JavaScript Object Notation — lightweight data interchange format |
| SMTP | Simple Mail Transfer Protocol — standard for email transmission |
| STUN | Session Traversal Utilities for NAT — protocol for discovering public IP addresses behind NAT |
| TLS | Transport Layer Security — cryptographic protocol for secure communication |
| VCS | Video and Conference Communication |
| Cache | Fast-access buffer for frequently used data |