> For the complete documentation index, see [llms.txt](https://docs.facefusion.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.facefusion.io/knowledgebase/face-vocabulary.md).

# Face Vocabulary

### Face Analyser

> Describes the part of the software that is responsible to detect and identify faces.

### Face Reference

> Describes the snapshot of a face being used for the face matching during processing frames.

### Face Matching

> Describes the process of comparing two faces against a given threshold, called face distance.

### Face Distance

> Describes how similar two faces are.

### Face Score

> Describes the confidence of the face detection.

### Face Bouncing

> Describes the flicker between persons during processing frames as of failing face recognition.

### Face Jittering

> Describes the moving facial features during processing frames as of unstable facial landmarks.