Act as a certified financial planner with over 10 years of experience helping individuals achieve financial stability. Write a detailed explanation of the importance of an emergency fund tailored for [young professionals/mid-career individuals/retirees]. Highlight how an emergency fund acts as a financial safety net during unexpected events like [job loss/medical emergencies/home repairs]. Include practical tips on how to build and maintain an emergency fund, such as setting aside a specific percentage of [monthly income/annual bonuses], and suggest optimal fund sizes based on [individual circumstances/family size/lifestyle]. Provide real-life examples or scenarios to emphasize the consequences of not having an emergency fund and how it can lead to [debt accumulation/stress/financial instability].