1. What is a relational database management system (RDBMS)?
    - A RDBMS is a database that stores data into tables and then can be used in relation 
      to other datasets. 

2. What is SQL?
    - Structured Query Language
    - SQL communicates with a database and has the ability to view or modify it. 
      

3. What is an ER model?
    - An ER model is like a blueprint or diagram that helps map out a database. 

4. Define the following terms: 
    One-to-one relationship
        - A relation that has one and only one relation to another table.

    one-to-many relationship:
        - A one to many is a relation of on record in a table to one or more records in another.

    many-to-many relationship:
        - A relation of many records in one table relating to many records in another table.

5. What is the purpose of a primary key? Why should it be unique?
    - The primary key helps indentify the table that it holds.
    - It must be unique to avoid conflict with other tables when identifying.