RestResource Annotation - What is the urlMapping To?

I have never worked with Rest Resource classes before and am trying to debug one from a previous developer.

I am looking at: @RestResource(urlMapping='/CompanyData/*') and am unsure what CompanyData is. I see from the documentation that they use standard objects in their examples so my assumption is that it would be a custom object, but it doesn't look like a typical standard object (with the __c). Could anyone enlighten me what this reference is to?

@RestResource(urlMapping='/CompanyData/*') global without Sharing class PartnerOpportunityService{ @HttpPost global static String createNewOpportunities() {...

• https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_classes_annotation_rest_resource.htm

• https://trailhead.salesforce.com/en/modules/apex_integration_services/units/apex_integration_webservices

• https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_rest_code_sample_basic.htm