What's the difference?

What is the difference between a “uni” tire and a regular bike tire? I have found a site that sells lots of 20" and some 24" bike tires with different treads and different sizes that hold up to 130psi can these be used on a uni? Is there something I’m missing? Dan’s Comp
I like the drive load tire (top right)

there really is no difference. most tires are made by bke companies either for unis or mod bkes.