Spacelift is an orchestration platform that handles workflows, which require computing power behind the scenes. Workers or runners process tasks in these workflows, and Spacelift uses public or private workers to manage them. Public workers are managed by the SaaS provider, while private workers are managed by the customer. Private workers offer benefits such as zero maintenance, predictable performance, built-in security measures, flexibility, scalability, better isolation, and direct access to private networks. They excel in regulated industries where compliance is a top priority, provide better debugging capabilities, and allow for dynamic scaling. However, they require internal maintenance, which can introduce operational overhead. Spacelift's public worker pool provides convenient zero-maintenance, predictable performance, and security, but private workers offer more control over workflow execution, improved security isolation, and superior resource management capabilities.