What are the capabilities of the DAO, domain, service, web, VO, and model layers

These levels are used to manage different code, making the code more maintainable. The development of the three-layer architecture is generally the MVC pattern to develop,
M: Representative model, can be understood as JavaBean;
V: Represents view, can be interpreted as JSP;
C: Representative controller, can be understood as action;
1.domain: This layer is used to manage JavaBean entity objects;
2.dao: Data access layer, access to the database;
3.service: The business logic layer to access the database by invoking the DAO layer;
4.web: Data display layer;

What are the capabilities of the DAO, domain, service, web, VO, and model layers