Jitterbit allows you to use simple or complex file types as sources or targets during the data transformation process. Simple files have the same data row type throughout the text document, while complex files contain multiple file row types such as header or summary rows.
As part of the transformation process, you need to define the File Format so that Jitterbit knows how to process the data. Typically, File Formats are generated as part of the Wizard walkthrough when creating your integration. After a File Format is created, you can modify it under the File Formats section in the tree on the left side of Studio. Or if you need to define a custom file format, you can also create a new File Format from the same section.