The rules of the game are pretty simple. There are two teams, the alien imposter(s) and the humans. The humans are tasked with making sure their space shuttle launches successfully by completing all of the objectives and finding imposters. The imposter on the other hand, must ensure that the ship doesn't take off by means of sabotage or killing all of the real crew members without being discovered.
Among us is only playable online with other humans (4-10 people), meaning the social interaction is baked in, you're forced to interact with both teammates and adversaries using real, spoken, human words – a luxury in a time where most people are living their lives intentionally avoiding contact with others.
In part due to the social aspect, Among Us packages the fun of playing a board game with friends into a format that, despite falling short of actually replacing human closeness, acts as a valuable sit-in for activities that (because of COVID-19) could potentially endanger ourselves and others.