The term 'Auction Site 24/7' can be solved by the four-letter word 'eBay'. eBay is an online auction and shopping website in which people and businesses buy and sell a variety of goods and services worldwide. It was founded in 1995 and has become one of the most popular websites for buying and selling items. eBay offers a wide range of products, from electronics to clothing, and provides users with an easy and secure way to purchase items. Additionally, eBay offers 24/7 customer service and support, making it a convenient and reliable option for buyers and sellers.