Slack, released in August 2013, serves over 30,000 teams across multiple platforms, offering features like real-time discussions, file sharing, and searchable conversation history. Designed to enhance professional communication, Slack enables team members to collaborate more efficiently than traditional email by creating topic-specific chat rooms and allowing non-employees to join dedicated projects. Users appreciate its ease of use and effective integration with services like Dropbox and Google Drive, making internal communication faster and more organized.