A more thorough explanation:

Federal Register

The Federal Register is a daily publication by the U.S. Federal Government that informs the public about changes to federal law. It includes presidential executive orders, proposed and enacted administrative rules, notices from administrative agencies, and documents that must be published before taking effect. The Federal Register is organized by categories like Science & Technology and Health & Public Welfare. You can view the Federal Register at federalregister.gov.

• A presidential executive order that bans travel from certain countries
• A proposed rule by the Environmental Protection Agency to limit carbon emissions from power plants
• A notice from the Food and Drug Administration about a new drug approval

These examples illustrate how the Federal Register informs the public about changes to federal law. The executive order, proposed rule, and notice are all published in the Federal Register to notify the public of these changes. By organizing the information by categories, it makes it easier for people to find information that is relevant to them.