VAERS (Vaccine Adverse Event Reporting System)

What is the CDC/FDA Vaccine Adverse Event Reporting System (VAERS) ?
​https://vaers.hhs.gov/about.html

A video on how to use the VAERS website:
https://www.youtube.com/watch?v=hTsXeANLj20

The CDC/FDA VAERS website:
https://wonder.cdc.gov/vaers.html