How to manage MultiMachine with Vagrant

############################# Video Source: www.youtube.com/watch?v=EYAj1SSQDcM

What is Vagrant file?How to create / provision single Apache vm from Vagrant file.How to create multiple VM's with Vagrant file.Advanced Vagrantfile.

Vagrant, Vagrantfile, Ruby, config.vm, vagrant box, vagrant up, vagrant destroy, vagrant ssh, vagrant halt
#############################