Why is it important to wash hands frequently?

Washing hands frequently is particularly important because our hands can harbor a significant number of bacteria, which may not always be visible. These bacteria can come from various surfaces we touch, including public places, food items, and personal items. Regular handwashing helps eliminate these harmful microorganisms, thereby reducing the risk of transmitting infections and illnesses to ourselves and others.

While it is true that dirt and dust can accumulate on our hands (as mentioned in the other options), the primary concern is the presence of bacteria and viruses that could cause serious health risks. Keeping hands fresh and clean is certainly a benefit of washing, but it doesn't encompass the core health rationale behind frequent handwashing, which focuses on hygiene and preventing disease spread.