Amazon's three-tier system is a structure for organizing and categorizing products on its website. The system is composed of three levels in a hierarchy, each representing a different level of detail and organization within the hierarchy.

1. Departments: These are the highest level of categorization and are designed to help consumers navigate the vast assortment of products available on Amazon. Departments include broad groupings such as "Books", "Electronics", "Fashion", "Grocery" and more.

2. Categories: Within each department, there are multiple categories that further break down the department into more specific groupings. For example, the "Electronics" department could contain categories such as "TV & Video," "Home Audio & Theater," "Gadgets," and "Wearable Technology."

3. Sub-Categories: The final level in the hierarchy contains sub-categories, which offer the most specific level of product grouping. This is where users can easily find and compare highly specific products. For example, within the "TV & Video" category, there could be sub-categories such as "LED & LCD TVs," "Smart TVs," or "OLED TVs."

The aim of this three-tier system is to help users find what they are looking for quickly, by narrowing down their search from a broad level to a more specific one.
### Instruction:
Explain Amazon’s Three-Tier System.

### Response:
