# Concepts and definitions
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This section describes key concepts and defines terminology specific to this solution.

 **AWSAccelerator** and **aws-accelerator** 

As of version 1.4.0, this solution allows for a user-defined resource name prefix in the [Installer stack parameters](step-1.-launch-the-stack.md). This guide uses the default prefix values `AWSAccelerator` and `aws-accelerator` for the named resource it describes. If you input a custom prefix, your solution-deployed CloudFormation stacks and Amazon S3 buckets use your custom prefix value.

 **landing zone** 

A cloud environment that offers a recommended starting point—​including default accounts, account structure, core networking infrastructure, and security configurations. Using a landing zone as a foundation, you can deploy your mission-critical application workloads and solutions across a centrally-governed multi-account environment.

 **Installer pipeline (`AWSAccelerator-Installer`)** 

Deploys an installer that, in turn, deploys the solution’s core features. Because this installer functions separately from the Core pipeline, you can update to future versions of the solution with a single parameter through the AWS CloudFormation console.

 **Core pipeline (`AWSAccelerator-Pipeline`)** 

Deploys the solution’s core features.

**Note**  
For a general reference of AWS terms, see the [AWS Glossary](https://docs.aws.amazon.com/general/latest/gr/glos-chap.html).