Note that while presales is a part of the sales process, it typically excludes the negotiation and contractual agreements.
The role of presales falls right in the middle marrying the customer needs to the (provider) company's services or products.
This role is especially crucial in these industries because the products and services are often heavily customizable and also because the requirements of different customers are often unique.
[5] In Canada and the United States real estate properties that are sold before construction is completed are referred to as Presales.
Sometimes, companies which release a product to a small, targeted group of potential buyers, prior to broader marketing and availability, refer to this limited early marketing period as "presales".