What Slack Is and How Teams Use It
Slack is channel-based team messaging -- conversations organized by topic or team rather than a single continuous inbox, with full-text search across message history (subject to your plan's retention window; the free tier caps searchable history at 90 days) and direct messages for one-on-one or small-group conversation. Threads keep replies to a specific message contained rather than cluttering the main channel feed.
Key Setup Considerations
A workspace starts with a small set of core channels (by team or major project) rather than one channel per tiny topic, which is easier to reorganize later than to consolidate after sprawl sets in. Notification preferences matter early -- Slack defaults to notifying on every message in channels you're in, which becomes genuinely overwhelming without deliberate configuration as channel count grows.
Actionable Considerations
- Start with a small, deliberate set of core channels rather than creating a new channel for every minor topic -- consolidation later is harder than starting lean
- Set notification preferences (channel muting, keyword-only alerts) deliberately from the start rather than letting default settings create alert fatigue
- Check your plan's message-history retention -- the free tier's 90-day search cap surprises teams who assume full history is always searchable