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

# Environments & SDK keys

> Isolate flag configuration per environment and connect SDKs securely.

An **environment** is an isolated copy of your flag configuration. Every organization starts with **Production** and **Staging**, and you can add more.

The same flags exist across all environments, but each environment configures them independently. You might enable a flag at 100% in Staging while it's still off in Production.

## SDK keys

Each environment has its own **SDK keys**. A key tells an SDK which environment to read and how to connect. There are two kinds:

<CardGroup cols={2}>
  <Card title="Client key" icon="globe">
    Prefix `slc_`. Safe to ship in browsers, mobile apps, and other public clients. Its configuration is served in an obfuscated form.
  </Card>

  <Card title="Server key" icon="server">
    Prefix `sls_`. For trusted backends only. Reads the full configuration and must be kept secret.
  </Card>
</CardGroup>

Find both keys on the **Environments** page. Choose the key that matches where your code runs.

<Warning>
  Never ship a server key (`sls_`) in client-side code. Use a client key (`slc_`) for anything that runs on a user's device.
</Warning>

## Choosing an environment

Point your development and staging builds at a non-production environment's key, and your production build at the Production key. Because configuration is isolated per environment, you can test flag changes safely before they reach real users.

<Note>
  An environment's configuration is independent. Changing a flag in Staging never affects Production.
</Note>