EC2
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Short for Elastic Compute Cloud
Virtual server
Server that can be used on a pay-as-you-go basis
https://gyazo.com/e7e40e232d25fedf52c619374a77dc53
It seems that it can also be managed as Reserved or Spot instances You can choose the specifications according to your usage
OS and other configuration information = AMI https://gyazo.com/65fbdf76853ae5238203127b0e9b6835
The share of OS types running on EC2 is said to be evenly split between Linux and Windows