There are many things that you see every day that you don't think about, despite how useful and important they are to people. C fold wipes is one of those things, a common sight within hospitals, public toilets and even some food places. A lot of people likely use them once per day at least, generally to get their hands clean and dry from whatever you've been using for, but also to wipe dirt, water, or other fluids off your face. They're effective and whenever anyone needs low cost hygiene stuff, cheap c fold wipes are one of the main things that people get for that purpose. As already mentioned, you mostly will see these in toilets, but some fast-food places and hospitals will have them too, albeit they tend to look differently and have different texture with the ones used in food places being smaller and smoother.
Disposable hygiene products like c fold wipes are one way that modern society has become much cleaner, as it removes the need to wash anything to use it again. It's a simple and effective solution and can range from anything from tissues and vipes to aprons and towels. Disposable hygiene products are mainly suited for places and professions where people often can get dirty or stained in one way or another, enough that a normal cloth towel or wipe would simply become unusable all too quickly. Some are even used in private homes, if only because it's easier to manage if you have many guests over.