What are regulations? How are they different from laws?
See this answer from the U.S. government website for regulations, Regulations.gov:
"After Congressional bills become laws, Federal Departments and Agencies are responsible for enforcing those laws through regulations. Departments and Agencies develop regulations through the Federal rulemaking process, most commonly through a notice-and-comment process. In general, Departments and Agencies publish proposed rules that are open for public comment, and after a specified timeframe, the Department or Agency publishes a final rule based on public comments and other information. Regulations.gov users can find Federal proposed and final rules published every business day by the National Archives and Records Administration (NARA) in the U.S. government's Federal Register, and submit comments through the web site to the Agencies on proposed rules that are open for public comment.
The Regulations.gov web site also houses other types of federal information. In addition to Federal regulations, many Departments and Agencies use Regulations.gov to post other types of documents open for public comment, such as Agency significant guidance. Certain Federal agencies also allow the public to initiate an action by filing a submission via Regulations.gov.
Each Department or Agency determines what information is made available on the site. Therefore, the information displayed on Regulations.gov docket and document details screens and comment forms is unique for each Department and Agency and conforms to each Department or Agency's internal policy. For additional information on a specific Department or Agency, visit www.usa.gov." from Regulations.gov