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One use case for this is to pass variable to template file when calling it with get_template_part().

// When calling a template with get_template_part()
set_query_var('my_form_id', 23);
get_template_part('my-form-template');


Now in you template you can then call it.
// Inside my-form-template.php
$my_form_id = get_query_var('my_form_id');