# Glossary (/en/realtime-media/rtmp-gateway/reference/glossary)

> For AI agents: see the complete documentation index at [llms.txt](/llms.txt).

## A [#a]

### Agora Console [#agora-console]

Agora Console is the site where developers manage Agora projects and services.

### App ID [#app-id]

An App ID is a randomly generated string provided by Agora and is the unique identifier of an app.

### App certificate [#app-certificate]

An App certificate is a randomly generated string provided by Agora for enabling token authentication.

### Audio mixing [#audio-mixing]

Audio mixing means combining multiple audio streams into one.

## C [#c]

### Channel [#channel]

A channel is a way of grouping users together and is identified by a unique channel name.

### Channel profile [#channel-profile]

The channel profile is a configuration that Agora uses to apply optimized algorithms for different real-time use cases.

### Cloud proxy [#cloud-proxy]

Cloud proxy is a proxy service that enables users to connect to Agora services through a firewall by using fixed IP addresses.

## D [#d]

### Delay [#delay]

In real-time audio and video communication, delay refers to the time elapsed from when data is sent to when it is received.

### Dual-stream mode [#dual-stream-mode]

In dual-stream mode, the Video SDK simultaneously transmits a higher-resolution video stream along with an additional low-resolution, low-bitrate video stream.

## H [#h]

### Host [#host]

The host is a user who has streaming permissions in a channel.

## J [#j]

### Jitter [#jitter]

In real-time audio and video communication, jitter is the variation in the delay of data packets transmitted continuously on the network.

## L [#l]

### Last mile [#last-mile]

The last mile refers to the network between the Agora edge server and the end user's device.

### Low-quality video stream [#low-quality-video-stream]

In dual-stream mode, the SDK transmits two video streams of differing quality at the same time.

## M [#m]

### Media stream [#media-stream]

A media stream is an object that contains media data.

### Media Push [#media-push]

Media Push enables you to upload audio and video streams from Agora channels to a CDN to reach a larger audience.

## P [#p]

### Packet loss [#packet-loss]

Packet loss refers to data packets transmitted on the network failing to arrive at their intended destination.

### Publish [#publish]

Publishing is the act of sending a user's audio or video data to the channel.

## S [#s]

### SDRTN(R) [#sdrtnr]

SDRTN(R) is Agora's globally distributed Software-Defined Real-Time Network.

### Stream [#stream]

A stream is a sequence of digitally encoded coherent signals that contains audio or video data.

### Subscribe [#subscribe]

Subscribing is the act of receiving media streams published by remote users.

## T [#t]

### Token [#token]

A token, also known as a dynamic key, is used for authentication when an app user joins a channel or logs in to Agora Signaling.

### Transcoding [#transcoding]

Transcoding is the process of decoding audio and video data and then re-encoding them into the target conversion output or format.

## U [#u]

### User ID (UID) [#user-id-uid]

In the Agora Video SDK, a user ID identifies a user in the channel.

### User role [#user-role]

The type of user role determines whether the user in the channel has streaming permissions.

## V [#v]

### Video layout [#video-layout]

Video layout arranges the display of users when multiple users are mixed into one stream, such as in Media Push or composite recording.

### Video mixing [#video-mixing]

Video mixing means combining multiple video streams into one.

### Video profile [#video-profile]

The video profile refers to a set of video attributes, such as resolution, bitrate, and frame rate.

### Video SDK [#video-sdk]

The Video SDK is an SDK developed by Agora to enable developers to add real-time video and audio interaction to their projects.

### Voice SDK [#voice-sdk]

The Voice SDK enables real-time audio communication.

## W [#w]

### Web page recording mode [#web-page-recording-mode]

In web page recording mode, the content and audio of a specified web page are recorded in a single file.