If you're looking for an internship to sharpen your Sales skills, check out United States where there are 600 opportunities. Public Relations and Marketing are right now the most sought after subcategories for this sector. If you're on familiar terms with areas like Retail, CRM and Negotiation, you're a shoo-in for jobs like this. 12% of jobs are from corporations in the Marketing sector. But companies in Insurance and Automotive are increasingly looking for Sales experience.