Slack Messenger is a cloud-based collaboration and messaging platform owned by Salesforce Inc. It is designed to organize workplace communication through channel-based messaging, allowing separate discussions for projects, teams, or topics. Key features include powerful search capabilities, integrations with over 2,000 apps like Google Drive and Zoom, audio/video huddles, workflow automation, enterprise-grade security, and cross-organization collaboration via Slack Connect. Users generally appreciate its organization, user experience, and integration capabilities, although some express concerns about notification overload, cost at scale, and a learning curve for new users. Compared to alternatives like Microsoft Teams, Google Chat, and Discord, Slack is seen as more responsive and suitable for structured environments. It is particularly beneficial for organizations already using Salesforce due to enhanced integration with Salesforce workflows.