can someone explain me the difference between cypress.io as testing framework and a BDD framework like cucumber e.g.
As far as I understand cypress.io is a ui-testing framework for javascript.
tests are written in javascript.
you can use scenarios to describe a flow through the app as e2e-test.
Is that similar to a behavior test or has this framework only focus on the ui?

Someone comes around the corner and says: Cucumber or JBehave is the same as cypress. I fear that's not true. but what are the arguments that can be answered.
I don't develop web-apps and it's hard for me to compare both solutions.

I try to clarify my question:
Imagine there's an application with backend services and a frontend (web-app) that uses these services. The backend represents complex workflows and the whole app shall be tested by a BDD Framework (e.g. cucumber). The major benefit is a kind of up-to-date documentation by feature- and scenario-descriptions. It's the core of a framework like cucumber. A further benefit it's of course the (maybe e2e) test itself. To have value it needs ui-testing to test the whole workflow. e.g. you could use selenium together with cucumber to handle this. I think cypress is a kind of testing framework like selenium, right? Only much better in many ways. But someone could say: "oh ... cypress is the same as cucumber, because you can also define scenarios, etc ... But I believe, when we think about BDD then cypress has to be used in combination with cucumber and not as a new stand-alone BDD-Tool. From my point of view cypress is a great ui-testing framework, but ... not more?! I anncounced my question here to find answers for clarification.