What is A/B testing, and how can it be utilized in interface development to optimize user experience? Provide a step-by-step guide to conducting an A/B test.

A/B testing plays a crucial role in the effective rollout of new features for software products by allowing businesses to make data-driven decisions about feature adoption, user experience, and overall product performance. This testing methodology involves comparing two or more versions of a feature, interface, or experience to determine which one performs better based on predefined metrics.