What is an Invoice? 

Invoice is an accounting term

An invoice or bill is a commercial document issued by a seller to the buyer, indicating the products, quantities, and agreed prices for products or services the seller has provided the buyer. An invoice indicates the buyer must pay the seller, according to the payment terms.
In other word, An invoice is essentially a detailed bill left by vendors and outside suppliers for goods or services rendered to a company. A typical invoice might list the quantity of each item, prices, billable hours, service description and a contact address for payment. While some expenses may be paid out of a general fund or petty cash account, an invoice is usually paid through an accounts payable department by the posted due date.

This information is by Aanand Gosh.

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