what's placement in this college. and which companies placement in this college?
You didn't mentioned the name of the college about which you are asking this question. To find such details you can visit the official website of the college and visit the placement cell option of the college. There you will find the past year reports as well as the companies visiting the company.
If you want a customized answer, then I would recommend you to rewrite your question and repost it on career360.com (//career360.com) with the name of the college and the course about which you are asking the placement and we will try you to provide as much information as possible.
I hope this helps.