Hi

There are a total of 23 IITs. Some of the top  IITs in India are listed below based on nirf ranking 2020 :-

*IIT Madras - Indian Institute of Technology Chennai , it has been ranked 1st  in nirf ranking 2020 and it is the best engineering college that you can get in the country .

*IIT Delhi - Indian Institute of Technology (IITD) , it has been ranked 2nd in nirf ranking 2020 .

*IIT Bombay - Indian Institute of Technology (IITB) , , it has been ranked 3rd in nirf ranking 2020 .

* IIT Kanpur - Indian Institute of Technology (IITK) , it has been ranked 4 th in nirf ranking 2020 .

* IIT Kharagpur - Indian Institute of Technology (IITKGP), it has been ranked 5th in nirf ranking 2020 .

*IIT Roorkee - Indian Institute of Technology, Roorkee  , it has been ranked 6 th in nirf ranking 2020 .

*IIT Guwahati - Indian Institute of Technology (IITG) ,it has been ranked 7th in nirf ranking2020 .

*IIT Hyderabad - Indian Institute of Technology (IITH) ,it has been ranked 8th  in nirf ranking 2020

* Indian Institute of Technology Indore, it has been ranked 10th  in nirf ranking 2020

The rank 9 in nirf ranking is taken by vNational Institute of Technology Tiruchirappalli

*IIT BHU Varanasi, Uttar Pradesh ,it has been ranked 11th in nirf ranking 2020

*IIT ISM Dhanbad  ,it has been ranked 12th in nirf ranking 2020

To get the complete list of all the 23 IITs you can go through our page the link for the same is provided below :-

https://engineering.careers360.com/colleges/list-of-top-iit-colleges-in-india

If I tell you about admission process, then admission in undergraduate engineering courses in IITs is through jee advanced examination. Also to be eligible for jee advanced you need to clear jee main first.

Thank you