A Neural Networks API is a set of programming tools that allows developers to create and manage neural networks, which are computational models inspired by the human brain. These APIs simplify the process of building, training, and deploying machine learning models, enabling users to focus on their applications rather than the underlying complexities of neural network architecture. Typically, a Neural Networks API provides pre-built functions and libraries for common tasks, such as image recognition or natural language processing. This accessibility helps both beginners and experienced developers implement advanced machine learning techniques without needing extensive knowledge of the underlying mathematics or algorithms.