Is Cucumber BDD or TDD?
Cucumber is definitely BDD, as the tests are written in plain simple language. However, this introduction of TDD & BDD on the Cucumber website mentions that there is no official definition of Cucumber 
Cucumber is not considered a part of BDD but it uses the concepts of BDD (i.e. Gherkin Language, feature files, and more). Did this confuse you further, hope not!