Slack is a instant messaging platform with a primary focus on team communication and collaboration. Slack is a productivity tool for teams and companies, irrespective of the size of the company. With an array of tools and features to help you organize and get work done, Slack can help move your projects forward by bringing the right people, conversations and information you need together. Slack over the years has become the go-to application for team collaboration, mostly because of its versatility and complete sync and support for all devices. Slack also has support for messaging bots and assistants with a complete extension store that allows you to browse and install them. Slack based on the Internet Relay Chat (IRC), offers many similar features - persistent chat rooms (called channels in slack) organized by topic, private groups, direct messaging and large-file content sharing. Any message can be used to start a “thread”, akin to threads in forums. And users can react to messages by adding emoticons to the messages. Slack’s free plan only allows the 10,000 most recent messages to be viewed and searched.