Second party audits are detailed reviews of your suppliers that provide you with the assurance that your supply chain meets the specific requirements you need.
These audits are customised and designed specifically to meet your requirements; they are carried out by competent personnel based on the Code of Ethical Behaviour contained in ISO 19011:2018.
The Reason for auditing your suppliers is that not all organizations have high quality standards as they promise. Therefore you need to make sure, everytime you get a new service or purchase a product, that they have established a quality framework.
By conducting a second party audit in each of your suppliers, you can decide based on facts, who can continue as your business partner and encourage your suppliers to grow according to your guidelines.