So, you know how sometimes grown-ups use a bus or a train to go to work or school? Well, a universal transit pass is something that makes it easier for them to use the buses and trains.
It's like a magic card that they can show to the bus driver or train conductor to get on board without having to pay every single time, kind of like a membership card for the buses and trains.
It's called "universal" because it works for all the buses and trains around a certain area or city, and everyone who has one can use it to ride as much as they want for a set amount of time, like a week, a month, or a semester.
It's pretty cool because it saves people money and time, and it's good for the environment too, because more people will choose to use public transit instead of driving their cars.