Please give a detailed explanation. It would be very useful if you could explain it from "economist" perspective for my final macroeconomics project. I appreciate your effort a lot. Thank you

4. Most governments have implied economic stimulus plans in order to boost economy recovery following the negative impact from the pandemic in 2020. (1 ) Introduce a few economic stimulus plans that are being implemented (including but not limited to U.S., China, European Union countries, UK, etc)