Do all banks allow ACH transfers?

I'm curious to understand if all banks in the financial landscape support Automated Clearing House (ACH) transfers. As a consumer, I'm aware of the convenience and efficiency that ACH transactions bring, but I'm not sure if this service is universally available. Could you elaborate on whether it's a standard offering across the banking industry, or are there specific banks or types of banks that do not offer ACH transfers? Additionally, if there are any exceptions or limitations, I'd like to be informed so that I can make informed decisions regarding my banking needs.