Bitcoin pizza refers to one of the earliest real-world transactions involving Bitcoin. On May 22, 2010, a programmer named Laszlo Hanyecz made history by completing what is widely recognized as the first commercial transaction using Bitcoin. Hanyecz posted on a Bitcoin forum, offering 10,000 bitcoins in exchange for someone ordering and delivering two pizzas to his address.

A fellow Bitcoin enthusiast took him up on the offer and ordered two pizzas from a Papa John's restaurant, having them delivered to Hanyecz's home in Jacksonville, Florida. In return for the pizzas, Hanyecz sent 10,000 bitcoins to the person who made the purchase. At that time, the value of Bitcoin was negligible, and this transaction is now famously known as "Bitcoin Pizza Day."

In hindsight, this transaction has become a symbol of Bitcoin's early days, highlighting how the cryptocurrency's value has grown exponentially since then. The 10,000 bitcoins spent on those two pizzas would be worth a substantial amount in today's market, making Bitcoin Pizza Day a lighthearted and memorable event in the cryptocurrency community.