Cloud virtual machine pricing is based on resource usage (CPU, RAM, storage) and additional services, with costs varying by usage duration and features like storage size and data transfer volume.
Security for virtual machines involves keeping them isolated, securing the host system, controlling access, protecting network connections, and regularly updating and configuring them to prevent vulnerabilities.
A virtual machine is like a virtual computer, and a virtual network is like a virtual set of connections that allow these virtual computers to communicate with each other.