Which feature allows you to share geometry between multiple parts?

The feature that allows you to share geometry between multiple parts is the iPart. iParts are a powerful functionality within Autodesk Inventor that enables users to create a family of components from a single base part file. This base part can share geometry and features among its variations, which means that when you modify the base geometry, all instances of the iPart are updated accordingly.

iParts help streamline the design process, especially when dealing with similar components that differ in size or configuration. By using an iPart, you can maintain consistency across parts, reduce file management complexity, and ensure that design changes are propagated throughout the entire part family without the need to edit each individual part separately.

The other features, while useful in their own contexts, do not specifically focus on sharing geometry in the same way. iAssemblies are designed for managing assemblies of parts, derived components are created from existing parts to create a new part with a copy of certain features but do not inherently share geometry updates, and file linking pertains to managing file references rather than sharing part geometry.