Slack is a cloud-native messaging and collaboration platform designed for teams. It organizes conversations into workspaces and channels, supports direct messages and threaded replies, and stores conversations and files so they can be searched and referenced later. Slack aims to reduce email volume and centralize project communication while connecting to many other productivity services.

Origins and development

Slack was developed by the company Tiny Speck during work on an online game called Glitch. The internal communication tool created to coordinate the game's development was later repurposed and launched to the public in 2013 as a dedicated team communication product. Stewart Butterfield, one of Tiny Speck's founders, is commonly associated with Slack's creation; more about his role can be found via related sources. The name "Slack" is an acronym that the company has described as standing for "Searchable Log of All Conversation and Knowledge."

Main features

  • Channels: Topic- or team-based spaces that can be public or private within a workspace.
  • Direct messages and threads: Private conversations and threaded replies to keep discussions focused.
  • Search and history: Persistent, searchable logs of messages and shared files so information can be retrieved later.
  • Integrations and apps: Connectors for services (CI/CD tools, calendars, file storage, bots) and a developer API for custom apps.
  • Cross-platform clients: Web, desktop, and mobile apps with notifications and synchronization.

Uses and impact

Organizations use Slack for day-to-day coordination, incident response, remote team collaboration, and as a hub for automated notifications from other systems. Its searchable history can preserve institutional knowledge, while integrations enable simple automation of routine tasks. Slack emerged as a popular alternative to internal email threads and informal messaging tools, influencing workplace communication norms.

Business model and notable facts

Slack operates on a freemium model with paid tiers that add features such as expanded message history, enterprise security controls, and administrative tools. In 2021 Slack became part of a larger enterprise software ecosystem through a major acquisition. Slack competes with other collaboration platforms (for example, Microsoft Teams) and is notable for its strong ecosystem of third-party apps and developer extensions.

Distinctions and considerations

Slack's emphasis on searchable, persistent conversation differentiates it from ephemeral chat apps. Common considerations for teams include message overload, the need for clear channel organization and etiquette, and appropriate access controls for sensitive information. Administrators can manage retention policies, single sign-on, and compliance settings to align Slack with organizational governance.