A very simple , easy and optimized code 
IntuitionCombine two DataFrames into one by stacking them vertically while preserving their original data and structure.ApproachUse pd.concat() to concatenate t
# Intuition
Combine two DataFrames into one by stacking them vertically while preserving their original data and structure.

# Approach
<!-- Describe your approach to solving the problem. -->
Use pd.concat() to concatenate the two input DataFrames. It stacks the rows from df2 below df1, preserving column alignment based on their labels.
# Complexity
- Time complexity: O(n+m)
<!-- Add your time complexity here, e.g. $$O(n)$$ -->

- Space complexity: O(n+m)
<!-- Add your space complexity here, e.g. $$O(n)$$ -->

# Code
```pythondata []
import pandas as pd

def concatenateTables(df1: pd.DataFrame, df2: pd.DataFrame) -> pd.DataFrame:
    return pd.concat([df1,df2])
    
```
['Pandas']