What is Slack?
Slack organizes conversations into channels that can be scoped to a team, project, or topic, alongside direct messages and threaded replies. Huddles provide lightweight audio and video calls without leaving a channel, and Workflow Builder lets teams automate routine steps like approvals or status updates without writing code. The Slack App Directory and Slack API connect the platform to third-party tools.
Read the full overview
Sources checked 27 September 2026: Slack features overview and Slack pricing.
Key capabilities
- Channels: public or private spaces for team and topic-based conversation.
- Huddles: quick audio/video calls started from a channel or DM.
- Workflow Builder: no-code automation for repeatable processes.
- App integrations: connections to external tools through the Slack API and App Directory.
Before rollout, decide channel-naming conventions, guest-access policy, message-retention settings, and which integrations are sanctioned. Message-history limits on the free plan and per-seat costs on paid tiers should be checked against actual active-user counts, not total headcount.
Slack fits organizations that want channel-based, searchable team communication rather than an email-first workflow. It competes most directly with Microsoft Teams and Google Chat; the deciding factors are usually existing investment in Microsoft 365 or Google Workspace, integration needs, and message-retention requirements.
Slack can reduce internal email volume by giving teams a searchable, channel-based record of decisions and files. Slack has been owned by Salesforce since 2021. Buyers should verify current integration depth, retention, and compliance features directly against Slack's own plan documentation, checked 27 September 2026 at slack.com/pricing, rather than general marketing claims.
Technical details
- Access
- Web platform
- Source model
- Other license
- Founded
- 2013
- Headquarters
- San Francisco, California, USA
- Pricing model
- Freemium
- API
- Available
- Website
- slack.com ↗
Official resources
What to verify for your environment
Start from the users, systems and operating responsibilities the tool needs to support.
- Confirm current features, licensing and support terms with the publisher.
- Validate deployment, data location, access control, backup and recovery requirements.
- Test integrations, export paths and a representative operational workflow before committing.
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