An AI backend serves as the essential infrastructure connecting applications to AI models and data processing systems, handling tasks such as API integration, data request processing, and scalability management. Key components of an AI backend include an API gateway for routing requests, an AI model layer for integrating APIs or custom models, an orchestration system for managing logic and provider switching, a database layer for data storage, and a monitoring layer for tracking performance metrics. Building an AI backend involves defining AI use cases, choosing appropriate providers, implementing a unified API layer, and incorporating load balancing and monitoring to ensure efficiency and cost-effectiveness. Platforms like Eden AI facilitate this process by offering a unified API for multiple providers, automatic routing, and a comprehensive monitoring dashboard, allowing developers to focus on feature development rather than integration.