An intruder in a general sense refers to an individual or entity that enters or interferes with a space, situation, or system without authorization, consent, or invitation. This term encompasses a wide range of scenarios, including trespassing onto physical property, accessing digital systems without permission, or disrupting the peace and security of a social setting. An intruder may intentionally or unintentionally breach boundaries, leading to concerns about safety, privacy, or security for those affected. Whether it's an unauthorized person entering a building, a hacker accessing confidential information, or an outsider disrupting a community's harmony, an intruder is characterized by their uninvited presence and potential to cause disturbance or harm.

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