Base Price is something related to the product. But often used in car sales. For the example you can check some Base Price of our CarSell website. This price means the starting cost of the standard model. It can be any optional features, upgrades, or additional fees. To be easy to understand, let's say this is the cost of the item with only the most basic features. 

Types

Standard Configuration for those products which have some basic features, with no additional packages or premium options.

Before Taxes and Fees is another kind of base price. But it doesn't usually include taxes, registration fees, or delivery charges with that cost. 

Customization Adds to Cost is like adding optional features. It can be advanced technology, upgraded materials, or performance packages. Basically this price is the increasing version of the final cost beyond the base price. 

Importance 

In business, especially in the car business, the importance of Base Price is really high. Because you can't sell a car without fixing it. Although this is the starting point to understand the minimum cost of a product. Which can help the buyers to compare different models or brands. It's important before factoring in customization or add-ons.