Usability measures how well users in a specific context can use a product to achieve a defined goal efficiently and satisfactorily. Creating wireframes allows you to answer the 2 most common questions software builders come across:

• What are some ways to solve the problems faced by our customers? To answer this question, you need to generate as many ideas as possible. The more ideas you have, the easier it will be to see the faults and highlights of each.
• How do I know if this solution actually solves their problems? To answer this question, you show your wireframes to others to validate and improve your ideas. That's when everyone looks objectively at a website's ease of use, conversion paths, naming of links, visual hierarchy, navigation, and feature placement.

Wireframes can point out flaws in your site architecture or how a specific feature may work. Finding these issues early on is always better.