What are Trump's reciprocal tariffs and who might be affected?

[US President Trump has proposed reciprocal tariffs that could increase tariffs on imports to match those applied by other countries. Analysts predict this measure could mainly impact emerging market economies with high duties on US products and further complicate international trade dynamics.
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https://economictimes.indiatimes.com/news/international/global-trends/what-are-trumps-reciprocal-tariffs-and-who-might-be-affected/articleshow/118220357.cms