Final answer:
The specific feature of e-business that enables customers to place an order immediately at a website instead of mailing an order form is online order entry.
Step-by-step explanation:
The specific feature of e-business that enables customers to place an order immediately at a website instead of mailing an order formbucts, select items, and complete the purchasing process directly on the retailer's website. This eliminates the need for physical order forms and enables customers to make purchases quickly and efficiently.
For example, if a customer wants to buy a product from a specialty retailer, they can simply visit the retailer's website, add the desired item to their online shopping cart, and proceed to the checkout to place their order.