The H-1B is a nonimmigrant (e.g., temporary) visa that is designed to allow U.S. employers to temporarily hire foreign workers in "specialty occupations", meaning in jobs that require a bachelor’s degree or higher (or its equivalent). The visa is generally used for professional positions in fields like science, technology, engineering, and science, though there are plenty of others. This visa is employer-specific, meaning you must have a job offer from a U.S. employer who will sponsor you. The statutory basis for the H-1B visa is found in 8 U.S.C. § 1101(a)(15)(H)(i)(b) if you are interested in reading more.

As per my my understanding The H-1B visa is designed for jobs that require specialized knowledge and a bachelor's degree or higher in a specific field Common fields include information technology, engineering, medicine, accounting, and scientific research