I was expecting it to be a language. It looks like Cucumber is actually a kind of IDE and the language is Gherkin .

Feature: Guess the word 
# The first example has two steps 
Scenario: Maker starts a game 
When the Maker starts a game 
Then the Maker waits for a Breaker to join 
# The second example has three steps 
Scenario: Breaker joins a game 
Given the Maker has started a game with the word "silky" 
When the Breaker joins the Maker's game 
Then the Breaker must guess a word with 5 characters