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

# Introduction to Collections

Collections are the backbone of Zixflow's data models, providing a structured framework for organizing information. Within Zixflow, you'll encounter two types of collections: system-defined and user-defined.

1. System Collections:
   * Person: Represents individual entities.
   * Company: Represents organizational entities.
   * Deal: Represents transactions or agreements.
2. Custom Collections:
   * Tailored to meet your specific requirements.

Users have the flexibility to create their own custom collections, allowing for a personalized data organization that aligns with their unique use cases. This dynamic combination of system and user-defined collections forms the foundation of Zixflow's versatile data management system.