Slack organizes team communication into channels — by project, team or topic — with threads, huddles for quick calls, and search across everything ever said. Its app directory connects the rest of your stack, so deploys, tickets and form submissions land where the conversation happens.
It suits teams replacing internal email and scattered DMs with something searchable. The free plan hides history after 90 days, which is the squeeze that converts growing teams — and busy workspaces need channel discipline to stay useful.