What will the following tax_query return?

What will the following tax_query return?

array(
  'relation' => 'AND',
  array(
    'taxonomy' => 'category',
    'field' => 'slug',
    'terms' => ['news', 'updates'],
    'operator' => 'IN'
  ),
  array(
    'taxonomy' => 'post_tag',
    'field' => 'slug',
    'terms' => ['featured'],
    'operator' => 'NOT IN'
  )
)