What is the difference between Amazon ECS and Amazon EC2?

I’m just getting started on AWS EC2. I understand that EC2 is like a remote computer where I can do pretty much everything I want. Then I found out about ECS. I know it uses Docker, but I’m confused about the relationship between these two.

Is ECS just a Docker install in EC2?
If I already have an EC2 and I start an ECS, does it mean I have two instances?

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