1. AE is a domain-agnostic platform for adaptive experimentation developed by Facebook. It allows using techniques like Bayesian optimization and A/B testing to iteratively improve systems based on experimental results. 2. AE supports sequential experimentation techniques including Bayesian optimization to automatically suggest promising parameter configurations. It also allows for human experts to manually select configurations. 3. The core API and backend services of AE are designed to handle large-scale experimentation workloads from companies like Facebook to help optimize systems like the DNN models and web interfaces.