> ## Documentation Index
> Fetch the complete documentation index at: https://docs.astrobee.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Glossary

> Key terms and concepts in AstroBee

## A

### Analytics Chat

The natural language interface for querying your data. Ask questions in plain English and get answers with full SQL transparency.

## D

### Data Hub

The central location for managing all data connections. Upload files, connect external tools, and explore your data.

### Data Layer

A semantic model that maps business concepts to raw data. Consists of entities, properties, and relationships. Previously called "Ontology" in some contexts.

### Data Source

A connection to external data—either an uploaded file or a connected service like Salesforce or Google Sheets.

### Dimension

A property used for grouping or filtering data. Examples: customer\_id, category, status.

## E

### Entity

A business concept in your data layer. Examples: Customer, Product, Order. Entities have properties and relationships.

### Entity Resolution

The process of matching records that refer to the same real-world entity across different data sources, even when identifiers differ.

## F

### Fact

An entity type representing measurable events or transactions. Examples: Order, PageView, Payment.

### Fivetran

AstroBee's partner for external data connections. A SOC 2 certified data integration platform.

## L

### Linkage

A discovered relationship between tables, typically a foreign key reference like `orders.customer_id` → `customers.customer_id`.

## M

### MCP (Model Context Protocol)

An open standard that lets AI assistants connect to external tools. AstroBee's MCP server enables querying data layers from Claude Code, Claude Desktop, or VS Code.

### Measure

A property that contains numeric values for aggregation. Examples: price, quantity, total\_amount.

## N

### Normalization

The process of standardizing data formats (like email case normalization) to enable accurate matching across sources.

## O

### OAuth

The authorization standard used for connecting external data sources. Credentials are never stored by AstroBee.

## P

### Pattern Analysis

Automatic discovery of data patterns in columns, such as ID formats, email structures, or date formats.

### Property

An attribute of an entity. Examples: Customer.email, Product.price. Properties are classified as Dimensions or Measures.

## R

### Relationship

A connection between entities in your data layer. Defined by cardinality (one-to-many, many-to-many) and join conditions.

## S

### Scratchpad

A working area for data layer changes before they're published. Review and publish changes to create a new version.

### SQL Transparency

AstroBee shows the exact SQL query generated for every answer, so you can verify and understand the logic.

## V

### Version History

The record of all published versions of a data layer, including conversation history and changes made.