What are order bulk actions? What can I do with them?

Order bulk actions allow designers to process multiple order simultaneously, saving time. In addition to printing shipping labels and printing pick lists bulk actions also allow you to:

1. Add private notes
2. Mark orders as shipped: For all orders shipping with the same courier, you can simultaneously mark them as shipped and provide tracking numbers for them.
3. Give reviews

More information:
What is “print shipping label”? I want to print the shipping address for an order. How do I do this?