If you are in the business of selling, who are you selling to? Do you know the characteristics of your customers? To target your marketing well, you need an archetype, which marketers call the ‘Buyer Persona’ or sometimes the customer or marketing persona. And sometimes they use ‘Avatar’.
Each of these terms means the same thing. If you do the work, up front, of characterising the people you want to sell to, you can better target your marketing.