What is quality service?

Dear Sir,  In order to explain the term "Quality Service", I will split it into two parts to easily understand it's enveloping properly.
The first one 'Quality', which is of course, we already mentioned it in another question, but we can pick up one of its definitions to serve our purpose:         'Quality is the state of being free from defects, deficiencies and significant variations, and it is brought about by strict and consistent commitment to certain standards that achieve uniformity of a product in order to satisfy specific customer or user requirements'.
   As we know product includes everything that you want to offer your customer, and includes the package of things like the item, after sales service, discounts, features and everything else.
While 'Service' is generally considered intangible product like teaching, advice..etc.
By this issue, Quality Service would mean the same meaning of Quality Product; referring to all together or one that satisfies your customer in all ways or optimal ways than others. 
The difference can be made in their application and use, i.e., product quality can measure the quality like the price, utility time, benefit accrual.
Example: a soap will satisfy you if it gives you standard things like foam, smell..etc.
While in case of quality service, the parameters are different because it depends on human feelings or satisfaction like one may like a teacher teaching a particular subject one may not.
So, they normally standardize things.
It is difficult to maintain service quality equal for all than a product quality because product quality can be set using machines, but one cannot predict the moods and feelings when one offers a service. 
Burger King's can offer a burger but the bearer offers service.
You may like the burger but not the service of the bearer.
So, you can feel like having a burger but you may not feel like going back to same Burger King's again, and the product quality is good not service quality.
Delivering quality service requires understanding the needs of our customers, listening to feedback and a dedication to continuous improvement.
Key to this is cultivating a motivated workforce to continuously drive service excellence within the organization.
Quality Service Management efforts thus underscore the importance of a highly effective service team that is well-trained and equipped to exceed the expectations of our customers.
Users of services judge the quality of services according to two criteria: firstly whether services assist them to achieve the outcomes they aspire to and secondly whether services are delivered in ways which empower them.
The argument is made that for services to meet the aspirations of customers, customers themselves need to be involved in improving them.
Recognizing the importance of customers’ judgments of service delivery has been embraced by putting people first, consultation and redress, as a culmination firstly of the desired effect of services on customers and the manner in which services are provided, as well as describing what the input process- relationship should be between customer views and service quality.
 The principle of quality is consequently examined as aspiring to meet what customers expect, as opposed to merely meeting specifications.
If quality management is approached as cyclical in nature; Public institutions will realize that evaluation should be based on customer expectations if they aim to become institutions that are truly responsive to people’s needs.
If public institutions in this way allow customer expectations to inform standards, the principle will be adhered to that quality is what the customer says it is.
 

It base on  proffesional way of service to make guest excited and beyond they are expectation in adition to create memorable exprience.

An assessment of how well a delivered service conforms to the client's expectations. Service business  operators  often assess the service quality provided to their  customers  in order  to improve their service, to quickly identify  problems, and to better assess client satisfaction.