What can I substitute for ramps?

I'm curious to know, what viable alternatives exist that can serve as substitutes for ramps in various applications or scenarios? Are there materials, methods, or designs that offer similar functionality or benefits, but with potentially different cost, durability, or accessibility considerations? I'm particularly interested in solutions that cater to accessibility needs for those with mobility impairments, as well as any environmental or aesthetic considerations that might factor into the decision-making process. Can you elaborate on some of the options available and their respective advantages?