TDD
Test-Driven Development
Test-Driven Development (TDD) is a software development technique where automated tests are written before the code.
Developers use those tests to drive the development.
BDD
Behaviour-Driven Development (BDD) is a set of practices that aim to reduce some common wasteful activities in software development:
Rework caused by misunderstood or vague requirements
Technical debt caused by reluctance to refactor code
Slow feedback cycles caused by silos and hand-overs
BDD aims to narrow the communication gaps between team members, foster better understanding of the customer and promote continuous communication with real world examples.