The process of applying to US universities is very different from that of Indian universities. Unlike India, US universities accept students in two intakes, namely, Fall and Spring. Furthermore, public and private universities in the USA have different application processes. For accurate information on admissions policies, be sure to thoroughly check the websites of all universities you’re applying to.
There are a few common application materials that Indian students need to submit for admission to US universities:
Standardised test scores
A good overall GPA
Written application materials including essays and SOPs
Letters of Recommendation from academic and job supervisors
English language proficiency test scores
Based on the program you are applying to, you will either have to apply separately for each university, or through common aggregator platforms for US universities.