How to pass parameter from child Component to parent component using LWC in Salesforce?

We have two Lightning Web Component childLWC and parentLWC. Our aim is to pass data from childLWC to parentLWC component. Salesforce link childLWC.html childLWC.js childLWC.js-meta.xml parentLWC.html parentLWC.js parentLWC.js-meta.xml link