The Create PDF actions are used to create PDF documents from documents of other formats, image files, scanned input or through splitting/merging existing PDF documents:
Convert Files to PDFs creates PDF documents from documents of other formats.
Create PDF from Images creates PDF documents from image files.
Create PDF from Text creates PDF documents from text files.
Extract Pages creates PDF documents from pages of existing documents.
Get Images From Scanner sources images from the local scanner for use with other actions from the Actions Library.
Split/Merge Documents splits single documents into several smaller documents, or combines multiple documents into a single file.