Escrow service, just like escrow payment above, is such kind of payment service in a transaction, in which a buyer does not send payment directly to the seller.
Instead, the buyer sends the payment to a trusted independent company (called escrow service company) where the payment will be held until such a time when the seller (or service provider) has delivered the goods or service to the buyer in good condition.
When the buyer has received the intended product or service, the escrow company goes ahead to release the withheld payment to the seller.