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

 **application** 

 A logical group of AWS resources that you want to operate as a unit. 

 **Dynamic Adaptive Streaming over HTTP (DASH)** 

 An HTTP-based streaming protocol (also known as MPEG-DASH) to deliver media over the internet and developed under Motion Picture Experts Group (MPEG). 

 **HTTP Live Streaming (HLS)** 

 An HTTP-based streaming protocol to deliver media over the internet and developed by Apple Inc. 

 **Quality-Defined Variable Bitrate (QVBR)** 

 A video encoding technology that uses fewer bits in low-complexitiy periods of content, and more bits during high-completely periods (up to the maximum bitrate), delivering consistently high video quality. For more information, see [What is Quality-Defined Variable Bitrate (QVBR)?](https://aws.amazon.com/media/tech/quality-defined-variable-bitrate-qvbr/) 

 **workflow** 

 Generated state machines that run a number of operations in sequence. 

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