In bioinformatics a dot plot is a graphical method that allows the comparison of two biological sequences and identify regions of close similarity between them. It is a type of recurrence plot.
More details of dot plot [here](https://en.wikipedia.org/wiki/Dot_plot_(bioinformatics)). Below, some examples of events which can be detected by dot plots.
## Match
When two samples sequence are identical, it's a match.

## Gap
Dot plots can be used to detect a gap between two samples: small sequence which exists only in one sample, between two matching regions.

## Inversion
Sequence which exists in the two samples but not in the same order.