Pre-MBA internships are offered by firms in various sectors like banking, consulting, and marketing. They last between 4-6 weeks and allow students interested in a particular career field to gain experience in that sector before their MBA program. Students can find pre-MBA internships through company programs, colleges, or by applying directly on company websites or through referrals. While pre-MBA internships are generally unpaid, they provide valuable experience for those who have decided on a post-MBA career path. However, some students may prefer to use the time before their MBA to address financial or relocation plans instead of an internship.