Vercel provides automatic Deployment URLs that allow you to share a live version of the changes you've made and collaborate with your team.
The format of Deployment URLs is consistent and predictable dependent on the Deployment Type. This article covers the case where a Deployment URL would be shortened and explains the reason for this.
RFC 1035
RFC 1035 mandates that the maximum length of a DNS label is 63 characters. As a result, if the automatically generated Deployment URL exceeds this length, it will be trimmed from the end of the URL to fall within this limitation. Where team slugs are used as part of the Deployment URL, the entire team slug will be trimmed if any amendments need to be made.