ACH (Automated Clearing House) is increasing in popularity because of the ease of transfering money from a consumer bank account to a merchant’s account.
It is safe and fast, and there is no risk of NSF returns.
It is also less expensive then credit card processing, as it is one small fee per transaction. And the merchant may charge a convenience fee.
ACH payments include:

• Direct Deposit of payroll, Social Security and other government benefits, and tax refunds;
• Direct Payment of consumer bills such as mortgages, loans, utility bills and insurance premiums;
• Business-to-business payments;
• E-checks;
• E-commerce payments;
• Federal, state and local tax payments.

Originator
Any individual, corporation or other entity that initiates entries into the Automated Clearing House Network

Originating Depository Financial Institution (ODFI)
A participating financial institution that originates ACH entries at the request of and by (ODFI) agreement with it's customers. ODFI's must abide by the provisions of the NACHA Operating Rules and Guidelines

Receiving Depository Financial Institution
Any financial institution qualified to receive ACH entries that agrees to abide by the NACHA Operating Rules and Guidelines

Receiver
An individual, corporation or other entity who has authorized an Originator to initiate a credit or debit entry to a transaction account held at an RDFI.