Automated Clearing House (ACH) is the name of an electronic network for financial transactions in the United States. ACH processes large volumes of both credit and debit transactions which are originated in batches… ACH credit transfers include direct-deposit payroll payments and payments to contractors and vendors. ACH debit transfers include consumer payments on insurance premiums, mortgage loans, and other kinds of bills. Businesses are also increasingly using ACH to collect from customers online, rather than accepting credit or debit cards. (from Wikipedia)