Jan Molak and John Smart, co-authors of 'BDD in Action: Second Edition', discuss behavior-driven development (BDD) and its essentials. They introduce BDD, its benefits, and the Gherkin language. They share advice on applying BDD, managing BDD specifications, and techniques like feature mapping and example mapping. They also discuss the screenplay pattern and the Serenity projects. They provide insights on testing layers to apply BDD and anti-patterns to avoid.