Taobao consists of the following systems:

1. User system: includes functions such as user registration, login, and account management, and is used to manage user identities and personal information.

2. Product system: responsible for adding, managing, and displaying product information on Taobao, including product titles, prices, descriptions, inventory, etc.

3. Transaction system: handles transactions between buyers and sellers, including order placement, payment, logistics tracking, etc.

4. Search system: provides product search functions, and queries and displays related products based on user keywords.

5. Recommendation system: recommends personalized products and stores to users based on user historical behavior and preference information.

6. Advertising system: responsible for displaying advertising space, and placing relevant advertisements based on user interests and behaviors.

7. Customer service system: used to handle user inquiries, complaints, and after-sales services.

8. Operation system: provides backend management functions, including product management, order management, user management, etc. The above are some of Taobao's core systems. Each system plays an important role and together they constitute the Taobao e-commerce platform.