Estimate the number of videos watched on YouTube per day.

To tackle this guesstimate, start by breaking down the problem into manageable components. Consider the global population and the percentage of people who use YouTube regularly. Next, think about the average number of videos each user might watch in a day. Factor in different demographics and usage patterns, such as age groups and regions. Finally, multiply these estimates to arrive at a daily total. Be sure to articulate your assumptions clearly and explain your reasoning at each step to demonstrate your thought process.