"Tier 1" typically refers to the highest level in a classification system, often used in various fields such as education, business, and technology. In education, for example, Tier 1 represents universal instruction that is provided to all students, ensuring they receive a solid foundation in essential skills. In business, Tier 1 companies are often the largest and most reputable firms in their industry, known for their significant market share and influence. These companies usually have strong financial stability and are often leaders in innovation and quality, setting standards for others to follow.