MS is the most common education students from India would like to study in USA. Admission criterion is different for every college but concept is same.
Student: Should send an application with all the required documents mentioned( You will find requirements in university website.). Read this article "Things to be done before applying for a university"
University: Review your application, give admission or reject admission or request extra information( on Hold)
Student: If university requested you any further information, try to provide all the info what they want.
University: If University accepts your application, then they will send you an acceptance letter (I20) to mentioned address of yours.
Students: Should gather all the documents needed for Visa ( See my post What to do after getting I20) and book a visa slot in near by USA Embassy.
USA Embassy: Takes student interview, have authority to give visa or reject visa or request extra information(on hold)
Student: If got Visa then no problems, if they ask you for further information, please answer them asap. If rejected ...try again.