CPC (Cost Per Click) represents how much brands are willing to pay for each click they receive on a given keyword.
In the context of SEO, it's not about a direct expenditure of money, but rather an indicator of the commercial value of a keyword.
A word with High CPC is usually associated with a high purchase intent, the conversion.
Therefore, when analyzing keywords, CPC helps to prioritize those that combine good search volume and potential economic value, maximizing the profitability of the content.