arr = np.array([1, 2, 3, 4, 5])

# Slicing creates a view (shares memory)
view = arr[1:4]
view[0] = 999
print(arr)  # [1 999 3 4 5] - original changed!

# Copy creates new array
copy = arr.copy()
copy[0] = 777
print(arr)  # [1 999 3 4 5] - original unchanged