How to get the job through internship

Getting jobs is now a days difficult for students.
Even when software crisis big colleges students also face similar problem.

I observed how some students are able to get job.

On of my observation was that I.I.T. student was doing internship at Amazon.
I just discussed with him.
Why he was doing internship as it is not permanent.
He said if he perform well internship, the company will hire him.

Even observed in small start up company , a V.I.T. engineering student was doing internship.
After couple of months, he equity 0.5% in the company along with salary.

When i was working in Amazon Chennai, I come to know the some engineering students from I.I.T. went to United States to do internship in big american companies.

Companies are recruiting interns from I.I.T., I.I.S.C., N.I.T. , Bits Pilani, famous central university, some private famous universities.

Companies are hiring the student based on basic of programming, reasoning, aptitude.
But they looking for passion, self learner, initiators, responsible students, high confidence.

I some where saw there is internship hiring in job portals, internship specific platform.