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I’ve started today with wordpress, I would like to know why do i have to call
<?php do_action('wp_footer'); ?>
before the </body> tag
Could someone also explain what is do_action()?
The do_action() creates a hook. Basically it prints out the contents of the wp_footer function at the bottom of your page by calling wp_footer(). You can also override that and create your own functions to output the footer.
check out: http://codex.wordpress.org/Plugin_API/Action_Reference/wp_footer