The **``deg2rad`` function** is used to convert degrees to radians. It comes as part of **NumPy**, which is a library of the high-level coding language Python. 

#   
#  Syntax
```Python
numpy.deg2rad(x, /, out=None, *, where=True, casting='same_kind', order='K', dtype=None, subok=True[, signature, extobj]) = <ufunc 'deg2rad'>
```
>A **universal function** (ufunc) is a function that operates on ndarrays in an element-by-element fashion. The `deg2rad` method is a universal function.
#   
#  Parameters
The ``deg2rad`` function accepts the following arguments.

* ``x``: array-like structure on the contents of which the ``deg2rad`` function will be applied. The input array will be in radians.

* ``out`` (optional): the function's output is stored at this location.
* ``where`` (optional): if set `True`, a universal function is calculated at this position.
* ``casting`` (optional): enables the user to decide how the data will be cast. If set as *same_kind*, safe casting will take place.
* ``order`` (optional): determines the memory layout of the output. For example, if set as `K`, the function reads data in the order they are written in memory.
* ``dtype`` (optional): the data type of the array.
* ``subok`` (optional): to pass subclasses, ``subok``must be set as `True`.
##   
## Return value
The ``deg2rad`` function returns the corresponding degree values of type float in an ndarray. If the optional ``out`` parameter is provided, it returns a reference. 

>If x is a scalar, the return value is also a scalar.
##   
## Example
The example below demonstrates how to apply the ``deg2rad`` function on an array that contains 4 degree values.

import numpy as np
degree=[180, 360, 720, 1440]
print(np.deg2rad(degree))

What is the deg2rad function in NumPy?

Converts degrees to radians using `numpy.deg2rad`. Takes array-like input, returns float ndarray, or reference if `out` is provided. Optional parameters available.