An overview of the Iterator toolset

The Iterator toolset has twelve iterators that help repeat a process or set of processes on a set of inputs.

Note:

The tools are intended for use only in ModelBuilder and not in Python scripting.

Iterator	Description
For	Iterates over a starting and ending value by a given value. It works exactly like For in any scripting/programming language, executing through a set number of items.
While	Works exactly like 'while' in any scripting/programming language, executing "while" a condition is true or false for the input or set of inputs.
Iterate Feature Selection	Iterates over features in a feature class.
Iterate Row Selection	Iterates over rows in a table.
Iterate Field Values	Iterates over each value in a field.
Iterate Multivalue	Iterates over a list of values.
Iterate Datasets	Iterates over datasets in a Workspace or Feature Dataset.
Iterate Feature Classes	Iterates over feature classes in a Workspace or Feature Dataset.
Iterate Files	Iterates over files in a folder.
Iterate Rasters	Iterates over rasters in a Workspace or a Raster Catalog.
Iterate Tables	Iterates over tables in a workspace.
Iterate Workspaces	Iterates over workspaces in a folder.