Slack is a channel-based instant messaging system that brings the team on one platform and connects all their software applications, files, and tools inside a secure, intuitive environment.

Slack offers several features for fast and efficient team communication. Users can use private channels for conversations they don't want open to all members, and the shared channels to collaborate with external organizations and clients for projects and tasks.

In addition to text communication, users can also make voice and video calls to collaborate with their team or search through the team's conversation history for relevant messages, files, and media.