"The Long Tail" is a concept that describes how businesses can profit from selling a large number of unique items in small quantities, rather than focusing solely on a few popular products. This idea was popularized by Chris Anderson in his 2004 article and later in a book. It highlights the shift in consumer behavior, especially with the rise of the internet, where niche products can find their audience. In traditional retail, companies often prioritize bestsellers, but the internet allows for a vast inventory of less popular items. This means that even though individual sales may be low, the cumulative demand for these niche products can be significant, leading to substantial overall revenue.