Modailty deals with what is necessary and what is possible; e.g., a necessary truth is a proposition that could not have been false, a necessary existent is an entity that could not have failed to exist, etc.

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Stanford Encyclopedia of Philosophy: Actualism
The thesis that there are no merely possible entities; by Christopher Menzel.
Stanford Encyclopedia of Philosophy: Modal Fictionalism
Survey of the view that claims of necessity and possibility are to be construed as fictional claims; by Daniel Nolan.
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