A more thorough explanation:

Definition: An electronic version of a paper check that is supplied by a consumer to a payee (usually a merchant) who uses the check to make an electronic funds transfer. The payee electronically scans the check's magnetic-ink character-recognition coding to obtain the bank-routing, account, and serial numbers, then enters the amount of the check. This is usually, but not always, done at a point-of-sale terminal.

Example: A customer goes to a store and wants to pay for their purchase with a check. Instead of writing a paper check, the customer hands the merchant an e-check. The merchant scans the check's information and processes the payment electronically.

Explanation: An e-check is a digital version of a paper check that allows for electronic processing of payments. The customer provides the necessary information on the check, and the merchant can process the payment without having to physically deposit the check at a bank. This method is faster and more convenient for both parties involved.