Hello Pankaj

There are three process for job recruitment.

1. On-campus drive
2. Off-campus drive
3. Pool-campus drive

1. For on-campus selection for job, company comes to the college and you get placement through college. College give mail about the recruitment drive. It is at college. All the process takes place within college.

2. For  off-campus drive, person directly go to the company may be physically or through company website.

3. Other one is pool-campus, which is neither off-campus nor on-campus. College provide mail about the company's recruitment drive occurring at other colleges. Students get placed through the college but recruitment process takes place outside the college.

Hope this information helps you..

Feel free to response  with likes and comments.

All the best.

Thank you!!