How to merge dataframes where a value is not matching in other column

I have huge data and I want merge it on a specific column where values from df1 is not available in df2 and vice versa.

Example:

df1:

Domain        Sales
google.com    100
facebook.com  200
youtube.com   300

df2:

Domain       Sales
google.com   100
yahoo.com    200
youtube.com  300

Required output:

Domain          Sales
facebook.com    200
yahoo.com       200

I have tried:

df = pd.merge(df1, df2, on="Domain", how="outer")

and all the other values for the how parameter, but it does not give me the required output. How can I achieve the required output?

>Solution :

pd.concat([df1, df2]).drop_duplicates('Domain', keep=False)