# Manage Namespaces - TypeScript SDK

> Efficiently create and manage Namespaces on Temporal using CLI or SDK APIs. Isolate Workflow Executions, control access with custom Authorizers, and manage via Temporal Cloud UI or CLI.

## How to create and manage Namespaces 

You can create, update, deprecate or delete your [Namespaces](/namespaces) using either the Temporal CLI or SDK APIs.

Use Namespaces to isolate your Workflow Executions according to your needs.
For example, you can use Namespaces to match the development lifecycle by having separate `dev` and `prod` Namespaces.
You could also use them to ensure Workflow Executions between different teams never communicate - such as ensuring that the `teamA` Namespace never impacts the `teamB` Namespace.

On Temporal Cloud, use the [Temporal Cloud UI](/cloud/namespaces#create-a-namespace) to create and manage a Namespace from the UI, or [tcld commands](https://docs.temporal.io/cloud/tcld/namespace/) to manage Namespaces from the command-line interface.

On self-hosted Temporal Service, you can register and manage your Namespaces using the Temporal CLI (recommended) or programmatically using APIs.
Note that these APIs and Temporal CLI commands will not work with Temporal Cloud.

Use a custom [Authorizer](/self-hosted-guide/security#authorizer-plugin) on your Frontend Service in the Temporal Service to set restrictions on who can create, update, or deprecate Namespaces.

You must register a Namespace with the Temporal Service before setting it in the Temporal Client.

### How to register Namespaces 

Registering a Namespace creates a Namespace on the Temporal Service or Temporal Cloud.

On Temporal Cloud, use the [Temporal Cloud UI](/cloud/namespaces#create-a-namespace) or [tcld commands](https://docs.temporal.io/cloud/tcld/namespace/) to create Namespaces.

On self-hosted Temporal Service, you can register your Namespaces using the Temporal CLI (recommended) or programmatically using APIs.
Note that these APIs and Temporal CLI commands will not work with Temporal Cloud.

Use a custom [Authorizer](/self-hosted-guide/security#authorizer-plugin) on your Frontend Service in the Temporal Service to set restrictions on who can create, update, or deprecate Namespaces.

### How to manage Namespaces 

You can get details for your Namespaces, update Namespace configuration, and deprecate or delete your Namespaces.

On Temporal Cloud, use the [Temporal Cloud UI](/cloud/namespaces#create-a-namespace) or [tcld commands](https://docs.temporal.io/cloud/tcld/namespace/) to manage Namespaces.

On self-hosted Temporal Service, you can manage your registered Namespaces using the Temporal CLI (recommended) or programmatically using APIs.
Note that these APIs and Temporal CLI commands will not work with Temporal Cloud.

Use a custom [Authorizer](/self-hosted-guide/security#authorizer-plugin) on your Frontend Service in the Temporal Service to set restrictions on who can create, update, or deprecate Namespaces.

You must register a Namespace with the Temporal Service before setting it in the Temporal Client.