Virtualization is a keystone technology in green hosting, allowing providers to consolidate workloads onto fewer physical servers. By running multiple virtual machines on a single hardware platform, hosts dramatically reduce energy consumption, physical space requirements, and waste. Cloud computing further enhances sustainability by enabling dynamic resource allocation—servers scale up and down only as needed, preventing unnecessary power draw during periods of low demand. This resource optimization not only lowers ecological impact but also improves reliability and flexibility for web project owners seeking scalable, sustainable options.