What are Anomalies/Outliers? And what are some variants of Anomaly/Outlier Detection Problems?

What are Anomalies/Outliers? And what are some variants of Anomaly/Outlier Detection Problems?
What are some Challenges and Work Assumptions of Anomaly Detection?
Explain the Nearest-Neighbor Based Approach and the different ways to Define Outliers.
Explain the Density-based: LOF Approach.
Provide the General Steps and Types of Anomaly Detection Schemes.

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