You should not ask this question. It will make you look bad. Basic knowledge is based on understanding the words used. Layer or service is not a technical term but the most commonly used English word in daily life. For example, ozone layer or rock layer or gas station service. How can you become an IT developer if your basic English is so inadequate?
CV của em thì em chỉ ghi Tech Skill: Java Core, Database (MySQL, SQLServer), JSP, Servlet Knowledge: OOP và MVC
If you don’t know what Data, Business and Presentation layer mean then how dare you claim that you have knowledge of MVC which represents Data, Business and Presentation Layer?
You know, your question on 2 simple words (layer and service) can easily destroy your career.