# Binary classification

> A type of classification task that predicts one of two mutually exclusive classes:

A type of [classification](https://wiki.g15e.com/pages/Classification%20model.txt) task that predicts one of two mutually exclusive classes:

- The [positive class](https://wiki.g15e.com/pages/Positive%20class%20(machine%20learning.txt))
- The [negative class](https://wiki.g15e.com/pages/Negative%20class%20(machine%20learning.txt))

For example, the following two machine learning models each perform binary classification:

- A model that determines whether email messages are *spam* (the positive class) or *not spam* (the negative class).
- A model that evaluates medical symptoms to determine whether a person has a particular disease (the positive class) or doesn't have that disease (the negative class).

## See also

- <Multi-class classification>
- [Logistic regression](https://wiki.g15e.com/pages/Logistic%20regression.txt) and [Classification threshold](https://wiki.g15e.com/pages/Classification%20threshold.txt)