Yes or No Site Column
A Yes/No column is used to render a simple true or false value.
To configure a yes/no site column, enter a name in the Column name textbox and complete the common properties. Then complete the additional column settings unique to this type of column.
Additional Column Settings unique to a yes/no site column:
- Default Value allows you to specify an initial value of either Yes or No for the column. By default this is set to Yes.