From what I understand, AWS Proton is similar to AWS Service Catalog in that it allows
administrators prepare some CloudFormation (CFN) templates which Developers/Users can provision when they need them. The difference is that AWS Service Catalog is geared towards general users, e.g. those who just want to start a per-configured instance by Administrators, or provision entire infrastructures from the set of approve architectures (e.g. instance + rds + lambda functions). In contrast, AWS Proton is geared towards developers, so that they can provision by themselves entire architectures that they need for developments, such as CICD pipelines.
In both cases, CFN is used as a primary way in which these architectures are defined and provisioned. You can think of AWS Service Catalog and AWS Proton as high level services, while CFN as low level service which is used as a building block for the two others.
because the end to end pipeline I can build using CodeCommit, CodeDeploy, CodePipeline, and CloudFormation
Yes, in both cases (AWS Service Catalog and AWS Proton) you can do all of that. But not everyone want's to do it. Many AWS users and developers do not have time and/or interest in defining all the solutions they need in CFN. This is time consuming and requires experience. Also, its not a good security practice to allow everyone in your account provision everything they need without any constrains.
AWS Service Catalog and AWS Proton solve these issues as you can pre-define set of CFN templates and allow your users and developers to easily provision them. It also provide clear role separation in your account, so you have users which manage infrastructure and are administrators, while the other ones users/developers. This way both these groups of users concentrate on what they know best - infrastructure as code and software development.
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