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The Table Prefix (point 5) is used to differentiate your Joomla data from other data stored in the database. One will be randomly generated in this space, though you can change it to whatever you would like.
Joomla Documentation /docs/joomla/platform/install_joomla_3x.mdIf it is a fresh install with a new database, this option really is not going to help or hinder you moving forward. Click the Next button to continue.
Joomla Documentation /docs/joomla/platform/rocketlauncher_3x.md