Mobile UX prototyping tools in the classroom [closed]

1. What is the easiest prototyping tool?
2. What are prototyping tools?

What is the easiest prototyping tool?

Framer: best tool for rapid prototyping

Framer is a fully integrated design, prototyping, and developer handoff tool that makes it easy to create app designs and prototypes that are as visually polished as a production app.

What are prototyping tools?

Prototyping tools allow the developer to quickly develop screens, reports, and forms to give end users the “look and feel” of the information system. By presenting a prototype to the end users early, the developer can gain valuable feedback and additional support for the project.