---
title: Backend (v2.1)
description: API reference for qiskit.providers.Backend in qiskit v2.1
source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit/2.1/qiskit.providers.Backend
---

# Backend

*class* `qiskit.providers.Backend`

[GitHub](https://github.com/Qiskit/qiskit/tree/stable/2.1/qiskit/providers/backend.py#L26-L35)

Bases: [`object`](https://docs.python.org/3/library/functions.html#object)

Base common type for all versioned Backend abstract classes.

Note this class should not be inherited from directly, it is intended to be used for type checking. When implementing a provider you should use the versioned abstract classes as the parent class and not this class directly.

## Attributes

### version

Default value: `0`