Usability focuses on how well users can learn and use a product they then share their opinion on what they thought of it how easy it was to navigate etc. Getting the right target audience to test out the product can be very helpful, based on the feed back it will be easier for the owner to tell if they're ready to release the product or not.
User testing would be helpful to me when creating / finishing my website things i need to think about:
- Target Audience
- When to do user testing
- How many people
- Questions to ask