In the real world, visual environments are unpredictable, which makes computer vision a highly challenging problem. Objects may appear differently depending on weather, lighting, movement, or camera position, making it difficult for machines to identify them consistently. For example, a stop sign may look different at night, during rain, or when partially blocked by another object. Noise, blurry images, and complex backgrounds add even more difficulty to recognition tasks. Convolutional Neural Networks help computers focus on important image features, but errors can still occur in applications like autonomous vehicles, where a small mistake in object detection could create serious safety risks.