Now that I think about it, it was probably before the pandemic. 🤔
Most mowers are four stroke like automobile engines, this includes pushmowers. Modern ones even have oil filters. Generally, riding mowers have two cylinder v-twin engines and pushmowers are single cylinder.
Two stroke engines are generally found on smaller things like chainsaws and weed eaters.
You mix special oil into the gas for two strokes. They do produce more smoke, especially when first started.