What key characteristic distinguishes Rapid Application Development (RAD) from previous methodologies?

Rapid Application Development (RAD) is primarily characterized by its emphasis on the use of prototypes. This approach allows developers and stakeholders to quickly create working models of applications that can be tested and evaluated. Prototyping enables users to provide immediate feedback, which significantly influences the iterative design and development process. This method fosters a more collaborative environment, allowing for adjustments and refinements based on user input throughout the development cycle.

In contrast to earlier methodologies, which often relied heavily on extensive planning and documentation before any actual development began, RAD's focus on rapid prototyping accelerates the development process. It allows developers to address user needs more effectively and facilitates faster delivery of functional software. Thus, the use of prototypes is what sets RAD apart as a more flexible and responsive approach to application development.