The word net in this sense means "total after all discounts".
It originally derives from the Latin nitere (to shine) and nitidus (elegant, trim), and more recently from the French net (sharp, neat, clean).
[2][3] Net 60 is not used as frequently due to its longer payment term.
Legally speaking, net 30 means that buyer will pay seller in full on or before the 30th calendar day (including weekends and holidays) of when the goods were dispatched by the seller or the services were fully provided.
Net 30 payment terms typically have an interest penalty for not meeting these terms and they begin accruing on the 31st day after dispatch.