What is feature selection in machine learning?

Subject: Machine Learning

Topic: Statistical Learning and Feature Engineering

Options:

1. Option A: Creating new features from existing ones.
2. Option B: Reducing the number of input features by selecting a subset of relevant features.
3. Option C: Scaling features to a similar range.
4. Option D: Converting categorical features to numerical ones.

Correct Answer:

Option B: Reducing the number of input features by selecting a subset of relevant features.

Explanation:

Feature selection is the process of selecting a subset of the most relevant features from the original feature set, discarding irrelevant or redundant features.