Ansible offers a simple, agentless way to automate configuration and deployments, while Ansible Tower builds on that foundation with a web UI, role-based access control, and job scheduling. Ansible is ideal for automating repetitive tasks, managing infrastructure at scale, and ensuring consistent configurations across systems. It's also useful for managing cloud environments and handling multi-node deployments. Ansible Tower, on the other hand, provides a centralized dashboard for managing, monitoring, and visualizing automation tasks, with features like role-based access control, job scheduling, real-time output, and centralized logging. The main difference between Ansible and Ansible Tower is that Ansible is a command-line tool, while Ansible Tower offers additional capabilities such as role-based access control, job scheduling, real-time output, and centralized logging, making it more suitable for coordinating automation across large, distributed infrastructures.