What is Slack? And what is it used for?

Slack is a workplace messaging platform that organizes communication into topic-based public or private channels, direct messages, and threaded replies, helping teams separate discussions while retaining searchable context. It also supports file sharing, quick audio and video “huddles,” screen sharing, clips, canvases for shared documents, lists for task tracking, emoji reactions, and Slack Connect for limited collaboration with external partners. Its extensive integrations and no-code Workflow Builder can deliver alerts from other tools and automate routine processes, while newer AI features can summarize conversations, search knowledge, and assist with tasks, though availability depends on the plan. Slack is used by businesses as an alternative or complement to email, as well as by hobby groups and online communities; its free tier includes core features but limits searchable history to 90 days, app installations to 10, and huddles to one-on-one calls, while paid plans add unlimited history, group calls, more integrations, and advanced AI, administration, and security features.

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