Difference between Data Model and Database Schema in DBMS?

Question

I know the Data Model is basically two types ER-Model and Relational Model & Database schema is also two type Physical and logical.

But I can not understand what

Answer 1

From what little i have understood, Data Model is a high level design which defines the kind of tables, the fields in those tables and the relations between different tables. Database schema describes the type(int, string etc) and constraints like length of field should be less than 20 characters. Database Schema refers to the Data model and specifies each table and field in detail.