The size of the sea represents the size of your market and by size, we mean exactly the quantitative number. Or in simple words, how many people could be your customer in total. Will you have thousands, millions, or billions, and what would be their expected age band? But to understand this data, it imperative to have a simple question about your idea. But keep in mind that one of the very big mistakes is when your idea is not crystal clear. So, if you do not have any idea or your idea is not still clear, do not worry. In module two we will talk about it and you will have a better understanding.