What is the purpose of bracing in a truss system?

Bracing in a truss system serves a fundamental structural purpose by connecting the top and bottom chords together. This connection helps to stabilize the truss by preventing lateral movement and distortion due to loads or environmental factors. When the top and bottom chords are effectively tied together, the truss can distribute loads more evenly throughout its structure, thus enhancing its overall strength and rigidity.

In contrast, the other options do not capture the primary function of bracing. Aesthetic appeal is not a structural necessity, as the main goal of bracing is functionality rather than appearance. Supporting windows is unrelated to the bracing of a truss system, which is primarily concerned about load transfer and stability within the structure itself. Increasing weight is also not a purpose of bracing; rather, bracing is designed to maintain structural integrity while keeping the system as efficient as possible. Therefore, connecting the top and bottom chords is crucial in ensuring that the truss system can perform its intended functions safely and effectively.