What kind of law/case is it when a company has very similar packaging and product names to a competitor?

For example, there's a product on the market and a competitor makes a similar product with very similar packaging. If the first company wanted to take legal action, on what formal legal grounds would they pursue this case?What kind of law/case is it when a company has very similar packaging and product names to a competitor?
Trademark InfringementWhat kind of law/case is it when a company has very similar packaging and product names to a competitor?
COMPANIES IN THE UNITED STATES ARE FULLY PROTECTED AGAINST IMITATION BY ALL FEDERAL COURTS.IN THE THIRD WOLD COUNTRIES,YOU CAN COPY AND MARKET MOST THINGS.

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