In FME Workbench, source and destination data is represented by objects in the workflow. In the same way, both geometric and attribute restructuring are represented by objects called Transformers.
A transformer is an FME Workbench object that carries out the restructuring of features. There are hundreds of different transformers that perform different types of restructuring.
The layout of Workbench windows may vary, but by default the Workbench Navigator will have a tab called Transformers. Click this tab to view the transformer list.
The Transformer Gallery is divided into different categories, or you can view all transformers at once. The easiest way to find a transformer is to focus the cursor on the canvas and start typing a keyword.
If you are familiar with FME mapping files, the transformers provided in Workbench encapsulate the FME Functions and Factories. Transformers manipulate your source data to achieve the desired output. Just like functions and factories, some transformers add attributes to features, others erase attributes, and still others will only transform the geometry. Transformers can operate on individual features, one at a time, or on groups of features.
You can also create and store Custom Transformers. See the Workbench Help for more information.