Automatic Clearing House
network used for electronic payments and money transfers
Usually used for small amount of domestic transfer
Automated clearing house
An automated clearing house (ACH) is a computer-based electronic network for processing transactions, usually domestic low value payments, between participating financial institutions. It may support both credit transfers and direct debits. The ACH system is designed to process batches of payments containing numerous transactions, and it charges fees low enough to encourage its use for low value payments.
https://en.wikipedia.org/wiki/Automated_clearing_house

Seonglae Cho