This document provides an overview of the key features and capabilities of the Bitrix24 collaboration and communication platform. It describes features such as the social interface, activity stream, messaging, video conferencing, employee profiles, mobile app, file sharing, workflows, calendars, meetings, telephony, email integration, company structure, file sharing and syncing, workgroups, project management, and wikis. The document is meant as reference material rather than a sales presentation and focuses mainly on the self-hosted on-premise version of Bitrix24.