Okay kiddo, so a westernizer is someone who wants their country to be more like the western countries. These western countries are places like the United States, Canada, and countries in Europe.
Now, this person thinks that if their country becomes more like the western countries, it will be better. They might want their country to have similar laws, education, or technology as these western countries.
Sometimes people become westernizers because they think that the western countries are better than their own country. They might think that the western countries are richer, safer, or more fun.
But, not everyone thinks that westernizing is a good thing. Some people want to preserve their own country's culture, traditions, and values. They might think that becoming more like the western countries would destroy these important things.
So, being a westernizer means wanting your country to be more like the western countries, but not everyone agrees that this is a good thing.