What is that whirring sound under the hood?

The whirring sound under the hood could be caused by several factors, often related to the engine or its components. Common culprits include the alternator, which generates electricity, or the Power Steering pump, which aids in steering. Additionally, a failing belt or a worn bearing in any of the engine accessories can produce a similar noise. If the sound persists, it's advisable to have it checked by a mechanic to prevent potential issues.