# Function - Order

Ordering is the process of finding the position of an element of ordinal data type in a sequence.

Order and Equivalence are a special kind of binary relation (ie relation between two entities)

With the order notion, you get immediately a sort and merge problem.

Comparison operator are at the heart of sort and merge problem problem.

## Natural

Natural order is the default attribute of a data type that will drive the sort process.

For instance, if you have a person object representing a person and if the default sort attribute is define to be by name, the natural order of the person object is by name. If you sort a collection of person without any specification, they will be sorted by natural order, ie by name.

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