The best summer internship for a computer science student typically offers hands-on experience in areas like software development, data structures, or machine learning, and may be with reputable tech companies, startups, or research institutions. Look for programs that provide mentorship, skill development, and opportunities to work on real projects, often requiring a strong academic record and relevant coursework or certifications. Selecting an internship aligned with your career interests and skill level maximizes learning and future job prospects.