A data given by the Magento is known as Sample data. This sample data is featured with many products (more than 250 products), promotion price rules, categories, etc. It saves a lot of your useful time at the time of building a storefront for testing since it operates exactly like a Magento storefront. Sample data can be used on demo store as well as database. You cannot use this into an existing Magento database because the break will be stored. The installation of Magento sample data can be done only for the new Magento installations, not for the existing one. For the installation of Magento sample data, you need to create a new MySQL database and also you have to add a user into it. Before installing Magento 2, you must create a database then import the Sample Data SQL File in the database that you have just created.
How To Install Sample Data To Magento 2?