What's the difference between ACH, EFT & Wire Transfer payments?

I do minimal work with accounts receivable, and oft get confused (and really dislike consulting the boss who will look at me like I have fourteen heads). When clients want to pay via EFT (electronic funds transfer) I understand that. Our company has two methods of transfer that they permit me to use: ACH... show more I do minimal work with accounts receivable, and oft get confused (and really dislike consulting the boss who will look at me like I have fourteen heads).

When clients want to pay via EFT (electronic funds transfer) I understand that. Our company has two methods of transfer that they permit me to use:

ACH (automated clearing house) or Wire Transfer.

What is the difference between all of these?
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