What characterizes an Easter egg in software?

An Easter egg in software is characterized by non-malicious code that reveals jokes or hidden features. These hidden elements are often included by developers as a fun surprise for users, rather than being intended as part of the core functionality of the software. Easter eggs can range from simple messages or graphics triggered by specific user actions to complex hidden games or features that add an element of enjoyment to the user experience.

The playful nature of Easter eggs distinguishes them from malicious code or software errors. They are created to enrich the user experience rather than disrupt it, which aligns with the definition provided in the correct answer. This represents a practice in programming that showcases creativity and adds a layer of engagement for users.