> For the complete documentation index, see [llms.txt](https://docs.symm.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.symm.io/contract-documentation/symmio-perps-v0.8.5/diamond-core-facets.md).

# Diamond Core Facets

## Diamond Core Facets

Facets are a core component of the Diamond architecture. They let functions execute logic against the Diamond's storage. Each facet contract is paired with an implementation contract that holds the facet's logic.

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#### Overview

Facets are modular units within the Diamond architecture. They allow isolated updates to specific parts of the system without redeploying the entire contract.

***

#### Functionality and Implementation

Each facet manages a distinct segment of the system's functionality. The implementation contract handles the logic, so that:

* Facets can modify the Diamond's storage in a targeted way.
* Updates stay isolated, reducing the risk of system-wide impact during changes.
* Separating logic from storage simplifies development and troubleshooting.

The following sections cover SYMM's facet contracts, the functions within each, and how they interact with the Diamond's core architecture.


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