How LiveCycle Forms ES renders forms
LiveCycle Forms ES can render form designs as PDF, HTML, or Flash-based interactive forms.
When form designs are deployed to LiveCycle Forms ES, rendered forms can be distributed to users directly through a web-based user interface. When a user requests a form, LiveCycle Forms ES applies an appropriate transformation of your form design to render the form.
For example, if the user asks for an interactive PDF form, LiveCycle Forms ES uses the PDFForm transformation to render the form.
See also 

How LiveCycle Forms ES renders forms