The type of text within a text field is characterized by its source:
Dynamic text includes content that is loaded from an external source, such as a text file, an XML file, or even a remote web service. For more information, see Types of text.
Input text is any text entered by a user or dynamic text that a user can edit. You can set up a style sheet to format input text, or use the flash.text.TextFormat class to assign properties to the text field for the input content. For more information, see Capturing text input.
Static text is created through the Flash authoring tool only. You cannot create a static text instance using ActionScript 3.0. However, you can use ActionScript classes like StaticText and TextSnapshot to manipulate an existing static text instance. For more information, see Working with static text.