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This question already has an answer here:

I am interested to know how the Boeing 787 cabin windows are made. Specifically, how many layers do they have and what can make them crack in-flight?

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marked as duplicate by fooot, SMS von der Tann, GdD, David Richerby, CGCampbell Oct 20 '17 at 17:14

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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This article about the Boeing 787 Dreamliner states that

[...] The Dreamliner’s new windows are made of two thin layers of glass with gel wedged between them. [...]

The windows have also a failsafe mechanism in order for the outer pane to crack or fail first, it's this tiny hole that you may have noticed, which serves to regulate the pressure exerted from the cabin to the window.

I couldn't find a more technical article about aircraft windows, but I found an AIAA article about Space Shuttle's cockpit window system, if you are interested about something a little bit more extreme!

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