How do I buy a domain directly from Icann?

Excuse me, could you please clarify the process for purchasing a domain name directly from ICANN? I understand that ICANN is the governing body for domain names, but I'm unsure of the specific steps involved in acquiring one through them. Is it possible to bypass traditional registrars and purchase a domain directly from ICANN? If so, what are the requirements and procedures I need to follow? Additionally, are there any limitations or restrictions I should be aware of when attempting to purchase a domain directly from ICANN? Thank you for your assistance.