Rating of hotels gives the prospective customer an idea o what all facilities he can expect. In India the star rating is given by the special accreditation committee called HRACC , which is under Ministry of Tourism.
However the accreditation is voluntary and has to be applied for with the prescribed formalities and fees.
The parameters for rating are many and spread from the front office staff to waste management, parking facility, 24 hour coffee shop, room service etc.
They also range regqarding the communicationfacilitieslike phone ,fax email , internet connection, etc and safety and security. The parameters also consider availability regarding other guest services like valet parking, wheel chair,dry cleaning and laundry, etc. The rating considers the hygiene and quality of kitchen and food and drinks supplied and made.
It may not be possible to list out all here.
We can get more specific details on visiting the web site of ministry of tourism (http://tourism.gov.in) and searching for "REVISED GUIDELINES FOR CLASSIFICATION, RE- CLASSIFICATION OF HOTELS WITH EFFECT FROM 19.01.2018"(URL-http://tourism.gov.in/revised-guidelines-classification-re-classification-hotels-effect-19012018)