'What ecs cluster mean in real application?

I want to learn what cluster in ecs means.

So I found that in aws "Cluster — A logic group of EC2 instances." - what does it mean? How many clusters/services/tasks should I create? Is it one cluster for my application? or my organization?

Can somebody explain to me please what is cluster and service and task in aws ecs but in the real application? say I have a website facebook.com and how it fit to aws ecs terminology?

Solution 1:^[1]

Let's assume facebook.com comprises several microservices - auth, social and marketplace to name a few.

We can deploy them to ECS this way:

a cluster per environment: test.facebook.com, staging.facebook.com and prod.facebook.com
a service per microservice. So it'll be auth, social and marketplace services
a task per instance of each microservice. Since we want facebook.com to be realiable, we'll add redundancy - there'll be multiple instances of each microservice

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Solution 1	Pavel Bely

'What ecs cluster mean in real application?

Solution 1:[1]

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Solution 1:^[1]