Protectionism is when a government takes steps to try and protect certain types of businesses from foreign competition, like from other countries. It can do this by putting in place rules that make it harder for foreign businesses to come in and invest or sell products. For example, it might impose extra taxes on foreign products to make them more expensive than the same products made by domestic companies. That way, people are more likely to buy from the local companies and those companies can keep their jobs and profits.