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### EC2 - Elastic Compute Cloud

Create virtual machines/instances.
The size of instances range from `micro` to 32+ processors with GBs of memory.
Instances can be placed in many different regions for redundancy (West Coast, East Coast, Europe, Asia, etc)

### IAM - Identify and Access Management

Create `Users`, `Roles`, and `Permissions`

### RDS - Relational Database Storage

Create Postgres, MySQL, Maria DB, or Aurora instances.
I think of this as a specific type of EC2 instance being created, with a database pre-installed.

### VPC - Virtual Private Cloud

Create public or private virtual clouds. Virtual clouds have many virtual containers/boxes/instances.

Public clouds often start with [CIDR blocks](https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing) like 172.30.0.0/24.
Private clouds often start with CIDR blocks like 10.0.0.0/16.

Within a VPC is a `Subnet`.  Subnets are use CIDR blocks to define ranges of addresses.  Subnets are often used to separate public and private traffic, as well as separate types of machines or processes.

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