As the Thanksgiving turkey is turned into leftover sandwiches, Americans are opening their wallets for Cyber Monday. The event is expected to be the largest online shopping day in history.

Cyber Monday, which takes place on the Monday after Thanksgiving, could see $6.6 billion in sales, according to Adobe Analytics, a marketing intelligence arm of Abode Systems. About 78 million Americans said they were planning to shop on Cyber Monday, according to a survey by the National Retail Foundation.

While Cyber Monday is a relatively new event, heavily discounted shopping after Thanksgiving is not a new phenomenon. The term Black Friday, which is the day after Thanksgiving, has been used since the 1960s. Both events tend to offer different deals on goods, but Cyber Monday is ideal for those who want to avoid crowds and long lines at brick-and-mortar stores. This year, Cyber Monday is expected to be the best day for sales on laptops, shoes and cosmetics, according to Adobe.

Black Friday saw $5.03 billion in online sales, a 15 percent increase over last year's $4.3 billion in online sales, according to Adobe. In total, online holiday spending this year is predicted to generate $107 billion in sales.