Gherkin is a simple, natural language syntax used to describe the behavior of a software application in a way that is understandable by non-technical stakeholders. It is used in conjunction with Cucumber to define the acceptance criteria and scenarios for a software feature.
It uses keywords, such as Given, When, and Then, to describe the steps of a scenario in a clear and concise manner. Gherkin allows developers to write executable specifications that can be easily understood and reviewed by the team.