The term "longtail" refers to a statistical phenomenon where a large number of items or events have low frequency, but collectively they can represent a significant portion of a market or dataset. This concept is often illustrated in business and marketing, where niche products or services may not sell as much individually but can collectively generate substantial revenue. In the context of the internet, the longtail effect is evident in online retail and content platforms. For example, while a few popular products like best-selling books dominate sales, countless lesser-known items can attract dedicated audiences, leading to a diverse and sustainable market.