Need Remain Product Quantity

I am using woocommerce plugin.Here in the stock i defined some number like 50.But when i made order this stock number will still remain same means 50.So i am totally confused how to get remain product quantity.

Please guide me on this topic
Please contact me through my email id neeraj.k@Omkarsoft.com

Thanks
Neeraj kumar

https://wordpress.org/plugins/woocommerce/