Slack

Slack is the business communication platform that permanently changed the way organizations communicate internally — replacing the fragmented, context-poor world of email threads and disconnected messaging apps with a channel-based communication model that keeps conversations organized, searchable, and contextually meaningful in a way that no previous enterprise communication tool had achieved. Founded in 2013 by Stewart Butterfield, Eric Costello, Cal Henderson, and Serguei Mourachov as a pivot from an online gaming company, Slack launched to immediate and extraordinary adoption, growing faster in its first year than any enterprise software product ever had, and fundamentally altering the expectations of knowledge workers for how workplace communication should feel and function. Slack's channel architecture — organizing conversations by team, project, topic, or any other dimension an organization chooses — creates a shared communication environment that makes institutional knowledge visible, decisions traceable, and onboarding dramatically faster than the opaque world of email. Slack Connect extends this architecture across organizational boundaries, enabling two or more organizations to communicate in shared channels as seamlessly as internal teams, transforming how companies coordinate with customers, partners, and vendors. The Slack platform — its apps, workflow automations, bots, and integrations with over 2,600 third-party services — has made Slack the central hub of digital work for millions of teams worldwide, connecting the tools and services they use into a single, unified workflow. Following Salesforce's acquisition of Slack in 2021 for $27.7 billion, the platform has been integrated with Salesforce CRM, enabling sales teams to bring customer data and collaborative workflows together in a unified environment. Slack AI, the platform's generative AI layer, brings automated conversation summarization, search-powered answers to questions about past discussions, and intelligent workflow suggestions directly into the channels and threads where work happens. For any organization seeking to replace the inefficiency and opacity of email-centric communication with a platform that makes team communication faster, more transparent, and more connected to the tools that drive work forward, Slack remains the definitive choice.