Your contacts database is central to every piece of your business. When you're using HubSpot, it's central to all parts of your HubSpot account. You'll use it to keep track of all the different people who have a relationship with your business, to personalize every interaction you have with them, and to attract more contacts like them.
Whether you have a database of five contacts or 10,000, you need to understand how to think about your contacts. There's a mental model that you can implement in your business to help achieve the goal of higher engagement. Your contacts are the heart for every other piece of your marketing and sales strategy.