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Let's say you have built a Mernstank application, which means you have got MongoDB for your database, Express and Node.js for the server side and React for the front end
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Now you want to run this application on another computer or server. Traditionally, you did have to install React, MongoDB, Node.js Express and set up everything step by step manually
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This will take a lot of time and you might make mistakes along the way
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But with Docker container, you don't need to go through this pane. Instead, you can package your entire Mernstack application into a Docker container
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This container will have MongoDB, Express, Node.js, and your React front end all set up and
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ready to go. So when you want to deploy your application on a different device, you simply take this Docker
