Cucumber is an open source test automation tool which is becoming very popular nowadays in Software market. It is a Behavior Driven Development (BDD) which is very important to add in your skill set.
Cucumber is easy to learn framework which is written in plain English language. This tool can be learned by anyone who does not have much automation experience.
Cucumber uses plain text executable to test the software. This makes everyone easy to learn and bridging the gap between the business people and developers.