The full form of NACH is National Automated Clearing House.

National Automated Clearing House Association (Nacha) manages the development, administration, and governance of the ACH Network, the backbone for the electronic movement of money and data in the United States. It is funded by the financial institutions it governs. The ACH Network serves as a network for direct consumer, business, and government payments, and annually facilitates billions of payments such as direct deposit and direct payment. The ACH Network is governed by the Nacha Operating Rules, a set of rules that guide risk management.

The Automated Clearing House (ACH) is the primary system that agencies use for electronic funds transfer (EFT). With ACH, funds are electronically deposited in financial institutions, and payments are made online.

Summary

• The National Automated Clearing House Association (NACHA) is in charge of maintaining everything related to the administration, development, and governance of the ACH Network.
• It is beneficial to everyone because of its convenience, speed, diligence with fewer errors, and it is overall a secure and confidential way of conducting business.  
• NACHA is in charge of an electronic funds transfer (EFT) payment system that allows the transferring of funds through online and mobile payments. It is also in charge of direct deposit, credit, and debit transactions.