I use a theme called vigilance

I am starting to build my own themes and I notice in this them a lot of functions will have the theme name vigilance passed into the functions like this one below...

<?php _e( 'This post is password protected. Enter the password to view comments.', 'vigilance' ); ?>

Notice the theme name is passed as the second parameter, I am trying to figure out why? I have not found anything supporting this in the docs yet?


It's the text domain, for use in internationalization.

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