> For the complete documentation index, see [llms.txt](https://docs.aitheon.com/aitheon-core/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.aitheon.com/aitheon-core/glossary/terminology.md).

# Terminology

### Connection

The link between [**Input** ](/aitheon-core/main-elements/inputs-and-outputs.md)of one [**Node** ](/aitheon-core/main-elements/nodes.md)([**Sub-graph**](/aitheon-core/main-elements/sub-graphs.md)) and other node's [**Output**](/aitheon-core/main-elements/inputs-and-outputs.md). 

![](https://11324685-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MFodfgQtPYjVLJ1kJJi%2F-MIt3yO5Lwo48AngCmKh%2F-MIt5I-p3Q6BFG7bILp5%2Flink.png?alt=media\&token=b971c692-9f36-4f1a-a7d4-2696587a8f75)

### Core node

A node in the [**Core Nodes** tab in **TOOLBOX**](/aitheon-core/main-elements/toolbox.md#core-nodes) of Core. A ready-to-use node for a common task.

### Graph table

Visual grid area with **Sub-graphs**, **Nodes,** and **Connections**. 

![](https://11324685-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MFodfgQtPYjVLJ1kJJi%2F-MIt5nb5FeJeLQdE_vbC%2F-MItBU-alzLnBgX32ltT%2Fgraph.png?alt=media\&token=b7e62088-5672-4644-8d98-139b70bafc39)

### Input and Output

Data (messages) that comes in and comes out of a node (sub-graph). You may directly connect input and output points on the graph table only if they have the same [**Socket** type](/aitheon-core/main-elements/inputs-and-outputs.md#socket-groups). To connect not compatible sockets, use a[ **Mapping node**](/aitheon-core/aitheon-core-quick-start/create-mapping-mode.md).

### Node

Node is the basic element of the Aitheon Core platform that allows a user to build business process logic without tech knowledge.

It's a separate block of logic (computer program) that processes data from [**Input** ](/aitheon-core/main-elements/inputs-and-outputs.md)and returns [**Output** ](/aitheon-core/main-elements/inputs-and-outputs.md)data. 

There are ready-to-use nodes, users also can place a [**request** ](/aitheon-core/aitheon-core-quick-start/add-provisional-node.md#publish-request)for an additional required node.

### Mapping Node

**Mapping Node** is a [**Node**](/aitheon-core/glossary/terminology.md#node) that allows connecting [**Sockets** ](/aitheon-core/main-elements/inputs-and-outputs.md#sockets)of different types. 

![](https://11324685-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MFodfgQtPYjVLJ1kJJi%2F-MIt5nb5FeJeLQdE_vbC%2F-MItFzi4GbQZpM-58DL2%2Fmappp.png?alt=media\&token=291c4520-16eb-4fe5-8d91-c8185ce56aa9)

### Provisional Node

**Provisional Node** is a [**Node**](/aitheon-core/glossary/terminology.md#node) that is created by the user for building visual business process logic on the graph table. When logic is ready, the user can make a [**Request** ](/aitheon-core/aitheon-core-quick-start/add-provisional-node.md#publish-request)to develop a [**Node**](/aitheon-core/main-elements/nodes.md) from the [**Provisional Node**](/aitheon-core/aitheon-core-quick-start/add-provisional-node.md)'s settings menu.

### Request

Describes in detail the logic of information processing for node development. May be submitted at [**Marketplace** ](/aitheon-core/main-elements/marketplace.md)and [**Provisional node** ](/aitheon-core/aitheon-core-quick-start/add-provisional-node.md)setting menu. 

Developers will take your request to development sooner if you offer a better price or if your request gets many votes from other users.

### Service Node

Specific [**Node** ](/aitheon-core/main-elements/nodes.md#nodes-types)for a specific Aitheon service (for example, Accounting, Robotics, Procurement, etc.) Placed in accordant [**Service Sub-graph**](/aitheon-core/main-elements/sub-graphs.md#sub-graph-types). Contains necessary procession logic for this service.

### Service Sub-graph

Specific [**Sub-graph** ](/aitheon-core/main-elements/sub-graphs.md)for a specific Aitheon service (for example, Accounting, Robotics, Procurement, etc.) Contains necessary [**Service Node** ](/aitheon-core/main-elements/nodes.md#nodes-types)for this service plus additional nodes, if needed.

### Socket

**Socket** is a specific type of [**Input** or **Output** **Message**](/aitheon-core/main-elements/inputs-and-outputs.md) set up in [**Node**](/aitheon-core/main-elements/nodes.md)'s properties. You may connect nodes with sockets of the same type. Using [**Mapping Node**](/aitheon-core/aitheon-core-quick-start/create-mapping-mode.md)**,** you can connect nodes with sockets of different types.

### Sub-graph

Like **Node**, **Sub-graph** is a basic element of the Aitheon Core platform, it allows users to build business process logic without tech knowledge.

Contains[ **Nodes**](/aitheon-core/main-elements/nodes.md) and [**Connections**](/aitheon-core/aitheon-core-quick-start/create-connection.md) between them. Used for a clearer view of automation process logic.