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

 **application** 

A group of resources that make up a single business service or application.

 **wave** 

A group of applications that will be migrated in the same event. This could be based on affinity between one another, or any other reason.

 **source** 

The on-premises or existing environment from which you migrate servers and workloads.

 **target** 

The AWS Cloud destination environment to which you migrate servers and workloads.

 **server** 

Source server to be migrated.

 **database** 

Source database to be migrated.

 **pipeline** 

A chain of tasks used to automate migration patterns containing multiple scripts and manual activities. This helps you to automate application migrations and transformations.

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