Requirements prioritization is the process of determining their importance for achieving project goals. The main prioritization methods include MoSCoW (Must have, Should have, Could have, Won't have), the Kano model, the 100-dollar test, pairwise comparison, and the priority matrix. For example, MoSCoW allows you to quickly distinguish critical requirements from less significant ones. The choice of method depends on the specifics of the project and the stakeholders involved.