# Introduction

- [Secure Contacts App (SCA)](/introduction/secure-contacts-app-sca.md): Welcome to the Secure Contacts Documentation
- [Quick Facts](/introduction/quick-facts.md): SCA - Quick Facts
- [Technical / Security Overview](/introduction/technical-security-overview.md)
- [Data Protection & GDPR Compliance](/introduction/data-protection-and-gdpr-compliance.md)
- [Editions](/introduction/editions.md): Overview: Standard vs. Enterprise Editions of Secure Contacts App (SCA)