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The collection bucket for everything you have committed to read or review.
Any set of similar items. Examples include:
Something you have made a commitment to read or review that will take more than 2 minutes. Examples include magazines, proposals, brochures, etc.
The set of things you need to discuss or progress with a given stakeholder.
A system of classifying into files (usually arranged alphabetically)
The complete inventory of the next physical, visible action you will take to fulfil some purpose.
The complete inventory of everything you have committed to that will take more than one action step to complete.
Anything you keep for future reference. It is very important not to blur the lines between things that require action and those that are purely reference material.
Everything that enables you to empty your head and keep things off your mind.