Comparing 2 columns of two Python Pandas dataframes and getting the common rows

Question

I have 2 Dataframe as follows:

DF1=
    A    B   C    D
0   AA   BA  KK   0
1   AD   BD  LL   0
2   AF   BF  MM   0

DF2=
    K    L
0   AA   BA
1   AD   BF
         


        

Answer 1

df1['ColumnName'].isin(df2['ColumnName']).value_counts()