A toilet lid is often seen as something you don't particularly need - some modern toilet models don't even have them.
Meanwhile, they can actually be extremely useful - so you better keep them closed when your toilet isn't being used.
Here are three main reasons for that.
Hygiene measures
Closing the toilet lid before flushing is a good idea because it helps prevent tiny water droplets from splashing out of the toilet.
These droplets can carry germs and bacteria from the toilet water, and they can land on nearby surfaces, like your toothbrush or towels, which can make you sick.
So, by closing the lid, you keep those droplets inside the toilet where they belong, and your bathroom stays cleaner and healthier.
Closed lids simply look better
Closing the toilet lid makes the bathroom look neater and cleaner.
It hides the inside of the toilet, which can sometimes not look very nice.
So, by keeping the lid closed, your bathroom looks tidier and more pleasant to use.
Safety matters
If you have small children or pets, an open toilet can be a safety hazard.
They might accidentally fall in or play with the water, which can be dangerous. Closing the lid helps keep them safe.
Conclusion
Toilet lids are created for reasons - they can keep your bathroom cleaner and nicer, and they also protect your kids and pets from bacteria.