What is the long tail theory? Can you give a simple answer?

"hits" is the head; "Missing" is a long forgotten tail.

The long tail theory, in general, means that in the past, it only paid attention to the "two" in the "28 Law", that is, a few concentrated and influential objects, while ignoring the "eight", that is, more public objects. It's like a vast and scattered area. If we can grasp this piece of land, the benefits will not necessarily be less than those in hot spots. The famous Google and Amazon online bookstores are classic models that successfully use the long tail theory to operate. The introduction of "bidding ranking" by Baidu in China is also a decision made after learning the long tail theory. It gives small and medium-sized enterprises the opportunity to spend little money on advertising on Baidu. These seemingly low-starting and low-cost strategies will be amazing when they get together.