PO stands for purchase order. In business it means a document a buyer sends a supplier that says what is being bought, at what price, in what quantity and on what terms, carrying a number both sides can refer to afterwards. The reason the abbreviation is worth a page of its own is that people meet it first on an invoice or in an email from finance, without context, and the useful answer is not the expansion but what the document does and what it commits you to. The free purchase order template on this site is the document itself.
What a purchase order actually is
A purchase order is the buyer's offer, written down. It names the supplier, the items, the quantities, the agreed prices, tax and shipping, the delivery address and date, and the payment terms, and it carries a number. It is sent before the goods, which is the whole point: it turns an intention into a record that existed before the money was committed. Everything a purchase order system does afterwards, approval, tracking, matching, depends on that document having existed first.
What it commits you to
Once a supplier accepts a purchase order, the two documents together generally form a contract on the terms stated, which is why the terms on the order matter more than their length suggests. This is a general description of how sales contracts are formed under the Uniform Commercial Code, linked below, and it is not legal advice; the specifics depend on your terms, your state and what the supplier's own paperwork says. The practical consequence for a small business is simple: do not treat the order as an internal note, because the supplier will not.
PO against quote, invoice and receipt
A quote is the supplier saying what they would charge. A purchase order is you saying what you are ordering, at what price, and it usually follows a quote. An invoice is the supplier asking to be paid for what they say they delivered. A receipt is proof you paid. They run in that order and each one refers back to the last, which is why the PO number appears on the invoice: it is the thread that lets you check the chain rather than take each document on trust.
Why the abbreviation is everywhere
Because the number is the thing everyone quotes. Suppliers ask for a PO before shipping, finance asks for a PO before paying, and both mean the number rather than the document. If somebody asks you for a PO, they are asking for an approved, numbered order they can reference. If your business does not issue them, that request is the moment to notice that nobody can say what has been committed, which is the problem this hub is written for.
Questions people ask about po meaning
What does PO stand for?
Purchase order: a document a buyer sends a supplier stating what is being bought, in what quantity, at what price and on what terms, carrying a number both sides can refer to afterwards.
What is a PO in business?
The buyer's written offer, sent before the goods. It turns an intention into a record that existed before the money was committed, which is what makes approval, tracking and invoice matching possible.
Is a purchase order a contract?
Once accepted by the supplier, a purchase order and that acceptance generally form a contract on the stated terms. That is a general description rather than legal advice; the specifics depend on your terms and your state, and are a question for your own adviser.
What is the difference between a PO and an invoice?
A purchase order is you ordering, sent first. An invoice is the supplier asking to be paid, sent after. The PO number on the invoice is what lets you check one against the other.