InstallJammer uses objects to define various pieces of an install.  Almost anything that is stored in your install is an object.  They are usually identified as having an ID that is the unique name of the object.  Below is a list of object types and a brief description of what they do.

Action

See What are Actions?

Action Group

See What are Action Groups?

Component

See Components.

Condition

See What are Conditions?

File Group

See Groups and Files.

Files and Directories 

See Files and Directories.

Pane

See What are Panes?

Setup Type

See Setup Types.