# 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.

 **Adaptive Bit Rate (ABR)** 

A streaming method that adjusts the video quality based on network conditions to improve video streaming over HTTP networks.

 **HTTP Live Streaming (HLS)** 

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

 **QVBR** 

Quality-Defined Variable Bitrate is 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.

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