Associations
- A link, relationship, ect. between two things
- Process of breaking database tables into seperate tables (2 or more),
 then reducing the table down to unique instances is called "Normalization"
- Foreign Key = A key of a foreign table
  -naming convention: -name of foreign table- + -id-
One to many association:
- belongs_to, describes association, passes in singular symbol
- has_many, decribes association, passes in plural symbol