Cognizant Technology Solutions — regarding offer letter for internship and job

Dear sir/madam, I had received an internship offer letter but still now I did not receive any job offer letter .many of my friends got their job offer letter too .Can you please give clarity whether we can get job offer letter without doing internship .If yes in how many days can I expect my job offer letter. Please look into this issue and retrive it back soon .

Thanks in advance