Bubble sort is one of the simplest algorithms to start learning Data structures and algorithms. It's a comparison-based algorithm in which adjacent elements are compared and swapped in order. This algorithm is suitable for small dataset.

It's not a very widely used sorting algorithm but is more often used as a teaching tool to introduce the concept of sorting.

*Time Complexity: O(n2)*

### How does Bubble Sort work?

compare the first and the second element. If the first element is greater than the second element, they are swapped.

Now, Compare second and third elements. Swap them to get them in order.

Repeat the process until the last element.

In each iteration, the comparison takes place up to the last unsorted element.

The array is sorted when all the unsorted elements are placed at their correct positions.

### Bubble Sort Implementation in Python

```
class BubbleSort:
""" BubbleSort Algorithm Implementation in Python 3.0+
arr: Unordered list
output: Return list in ascending order.
time complexity: O(n2)
Example :
>>> sort = BubbleSort()
>>> sort([4,2,6,5,9,8])
[2, 4, 5, 6, 8, 9]"""
def __init__(self):
print("Bubble Sort Algorithm is Initialized")
def __call__(self, arr):
n = len(arr)
for i in range(n):
already_sorted = True
for j in range(n - i - 1):
if arr[j] > arr[j + 1]:
arr[j], arr[j + 1] = arr[j + 1], arr[j]
already_sorted = False
if already_sorted:
break
return arr
sort = BubbleSort()
print(sort([10,9, 5, 11, 2]))
```

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