What is the meaning of Preview?

An experience of something in advance.

An advance showing of a film, exhibition etc.

A short collection of clips edited together to advertise a film, television show, etc.; a trailer.

Something seen in advance. (Can we add an example for this sense?)

A facility for viewing and checking a document or photo, or changes to it, before saving or printing it.

To show or watch something, or part of it, before it is complete.

To show something in advance, a facility for viewing and checking a document or photo, or changes to it, before saving or printing it.

Source: wiktionary.org