Function as a Service (FaaS) and Container as a Service (CaaS) are two popular deployment strategies in cloud computing, each offering distinct benefits and challenges for application development and deployment. FaaS allows developers to deploy code as functions that are managed and scaled by a cloud provider, making it ideal for simple tasks and high-volume workloads, while simplifying development and reducing costs through serverless architecture. However, FaaS can pose challenges in rewriting applications and managing dependencies, with potential issues in debugging and testing due to the lack of standardization across providers. On the other hand, CaaS uses container technology to package applications in a portable and flexible manner, enabling easy scaling and consistent performance across different environments, though it often requires users to manage orchestration and scaling unless paired with serverless platforms. Both FaaS and CaaS have transformed cloud computing by relieving developers from infrastructure management, thus enhancing efficiency and cost-effectiveness, especially when combined with serverless technologies offered by platforms like Koyeb, which provide auto-scaling, security, and minimal overhead.