# Glossary

### Archetype

Group of Components that define a type. Makes use of LODs.

### Client

Allows a User to interact with the World. Connects to Replication Server.

### Client connection​ <a href="#client-connection" id="client-connection"></a>

An object representing a client connected to the Replication Server. Required for the client messages.

### Client message​ <a href="#client-message" id="client-message"></a>

A message sent to a *client connection*.

### Command

Allows for sending an instruction to an Entity that may be running on a different machine.

### Component

Describes a characteristic or aspect of an Entity.

### Connected Entity

An Entity that is connected to another Entity through a parent-child relationship. Connected Entities are subject to their parent's LiveQuery, i.e. they are replicated only if their parent is.

### Entity

A networked GameObject.

### LiveQuery

Allows the Client to specify a subset of the World to receive updates from. Acts as a filter to exclude updates on less relevant Entities that could otherwise result in undesired latency.

### LOD

A partial representation of an Archetype. Allows for specifying priorities of components within an Archetype.

### Key-value store

The key-value store provides a simple persistence layer for the players. The key-value store matches a short key (identifier) to a specific value (data payload) held in a simple, unstructured database. There are no limits to the total number of key/value pairs as long as the total size stays under 256KB.

### Multi-Room Simulators

Multi-Room Simulators are Room Simulators which are able to simulate different Game Rooms at the same time.

### Protocol Code Generator

Generates the client schema source file (e.g. schema.cs) that automatically handles serialization/deserialization of networked GameObjects and commands.

### Replication Server

Replicates the state of the world to the connected Clients and Simulators.

### Rooms

Short-lived multiplayer environments for dozens of players. Perfect for quick session-based matches.

### Simulator

Responsible for simulating a subset of the Game World. Connects to Replication Server through which the state gets replicated to Clients.

### Worlds

Long-lived and permanent multiplayer environments for thousands of players. Best suited for MMO types of games.


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