Intermittent Fasting (IF) is where each day has an Eating Window and a Fasting Window.
Practically, IF has a standard format called the 16:8 model where you fast for 16 hours and eat within 8 hours.
I have followed this model for 3+ years. Each day, I eat between ~12pm and ~8pm, and I am in a fasted state from ~8pm to ~12pm the following day.
My approach is that I stop eating by 8pm each day, skipping breakfast the next day, and starting each day with lunch.
This episode gives you the gist of Intermittent Fasting's many benefits, and how to get started if you want to try it yourself.