1. For a call, when an option's strike price is higher than the market price of the underlying asset.
2. For a put, when the strike price is below the market price of the underlying asset.
Investopedia Says:
Basically, an option that would be worthless if it expired today.
Related Links:
An introduction to the world of options, covering everything from primary concepts to how options work and why you might use them. Options Basics Tutorial
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