A "public suffix" is one under which Internet users can (or historically could) directly register names. Some examples of public suffixes are .com, .co.uk and pvt.k12.ma.us. The Public Suffix List is a list of all known public suffixes.
See https://publicsuffix.org/ and the Wiki link above for more information.
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All submissions must conform to the validation and acceptance factors and provide sufficient rationale or basically be as complete as possible, and follow the Guidelines, especially as they relate to format and sorting.
The list is currently maintained by people who are volunteering their time towards universal acceptance and ensuring there is a bridge between the ICANN world of domain names and the crucial last mile - the world of developers and human users.
Iteration back and forth will delay PR review or inclusion. Be extremely thorough, and patient.
Important Notice:
2023-02-20 : Did guidance from Google related to the changes that they are making to adsense subdomains bring you here? Work with Google Adsense Help Link with any support questions you have. The PSL is thinly resourced, and the volunteer maintainers are unable to answer questions about Adsense changes or support Adsense.
The PSL is volunteer-resourced and is absolutely not resourced to answer questions or support changes. Guidance is in the form of self-help (READ THE WIKI), THERE IS NO PSL CUSTOMER SERVICE RESOURCE TO ASSIST YOU. Please work directly with Google to ensure your domain does in fact need an entry, and they should help you know what the benefits and consequences are. IT POSSIBLE TO HARM YOUR WEBSITE COOKIES BY REQUESTING A MAL-FORMED PSL ENTRY. Also, understand what propagation delays and rollback processing entail before making requests.
2021-04-23 : Did guidance related to an issue with Facebook or Apple bring you here? Read this before submitting requests We are not approving workaround requests per the validation and acceptance standards, but do have open discussion with Facebook on the matter.