Can I export Users from phpmyadmin ?

Hi, Can I export users from PHPMyAdmin and how can I import them again ? Also Can I import users by using WP importer in WP Dashboard ? When we buy any theme there is always a smaple data and demo file just upload that file all images and users everything will be uploaded into that site , so here in PHPMyAdmin we can export in different formats like xml. as sample data. in any new theme we bought . There is must me a way to do the same here even we have thousands of users, we can export them then import them again in any site . please clarify more with details and examples how to do that