The main purpose of a hypervisor in virtualization is to manage and allocate resources among multiple virtual machines (VMs) running on a single physical host. It abstracts the underlying hardware, allowing each VM to operate independently, even if they use different operating systems. Hypervisors can be categorized as Type 1 (bare-metal) or Type 2 (hosted), depending on their architecture. By managing the VMs, hypervisors enable efficient usage of hardware resources, improve scalability, and simplify the deployment of applications. Moreover, they enhance isolation and security, ensuring that issues in one VM do not affect others, making virtualization a popular solution for data centers and cloud environments.