A note is an element of a Tinderbox file, it has a Title (Name), a Text body, and Attributes (the Name is itself an attribute). A note is best thought of as the 'atomic' entity of information within a Tinderbox file.
A note may also act as a prototype for other notes.
A note is edited via its Note window.
Notes are often also defined as Paths.
Any note containing other notes is a 'container'; put another way, a container is any note that has children/descendants. Agents are a special class of container, holding an alias to every note matching the query stored in their $AgentQuery attribute.