Validate your hypothesis in an agile way, materializing the first deliverable prototype.
Prototypes are interactive designs created in interface design applications like Adobe XD or Figma and are not programmed. Protypes are used to polish the product before devolping it.
Templates for digital products such as websites and apps are valuable time savers, but they are completely generic and can usually generate experience problems when not modified in the right way. UX/UI design can be used to work on a template, or from scratch to generate an experience that is specifically focused on your company's customers.
A wireframe is an early and simple sketch that allows a very quick visualization of a digital product, similar to an architectural plan of a construction project. A high fidelity prototype is a final sketch that contains details and information as accurate as possible to what is desired in a finished product, similar to a 3D rendering of a construction project.