What does a 'web' refer to in structural terms?

In structural engineering, the term 'web' refers to the vertical or diagonal components within an I-beam or a similar structural member that connect the flange sections. The web is crucial as it bears shear stresses and contributes to the overall strength and stability of the structure. It plays an essential role in transferring load and providing structural integrity.

While the other options may sound plausible in different contexts, they do not accurately define the structural concept of a web. For instance, a decorative feature does not have the same functional role as the web in a structural component. Likewise, a thin layer of insulation addresses thermal properties rather than structural requirements. Similarly, while a flooring system may involve structural elements, it does not pertain to the specific terminology of a 'web' in structural engineering. Thus, the definition of a web as a connecting metal plate correctly represents its function and importance in constructing various structures, including containers.