What are the services that accompany the product?

it's acquisition , installation, usage , maintenance and disposal , including all the types of products or services . humain interaction c play an important role in this process

1. There are 2 Main services basically one is Pre Sales (Product , Price , Position, People ) and other is Post Sales (Avaialbility , Response )which normally accompany a product can be classified as below 2

1. Material or the Product Quality 

2. Human Interface for the Service of the Product

services that provided after sale

After-sales service includes what you do at the point of sale, including your customer service and selling techniques. It also includes how you follow up after the customer has left, such as providing follow-up contact and effectively dealing with complaints.

This guide highlights the importance of after-sales service and explains customer service techniques that will help you build better relationships with your customers.

ReliabilityResponseMeritAccessibilitySecurityPhysical component

Service after sell ( repair _ change  some part and check after some time ) and for production ( food) need check with customer and follow for each mark 

I apologize for the answer , I leave the answer to the specialists the experts in this the field , that's not my area  special, I hope  you invite specialists only .