**`winreg`** (Windows Registry API) provides functions to expose the Windows Registry API to Python. We use this module to expose a low-level interface to the registry.

# DeleteKey
We use the method **`DeleteKey`** to remove any specified key. The method takes the `key` and `sub_key` as parameters. Using this method removes a key and its values. Otherwise, the method raises an `OSError exception`. 



## Syntax
```
winreg.DeleteKey(key, sub_key)
```
## Parameters

**`key`**: Any open `HKEY_*` constant or one of the predefined `HKEY_*` constants can be given as a parameter to the method.

**`sub_key`**: This is the subkey of any given key. It is a string value. This parameter cannot be `None`. 

> The method cannot delete keys that have subkeys. In that situation, the subkeys must be removed first before deleting the key.






What is winreg.DeleteKey in Python?

winreg.DeleteKey removes specified keys and their values from the Windows Registry. Subkeys must be deleted first.