A more thorough explanation:

A Statement of Use is a legal document filed with the United States Patent and Trademark Office (USPTO) that proves a trademark is being used in commerce. It is required for trademark registration and must be filed within six months of receiving a Notice of Allowance from the USPTO.

For example, if a company has applied for a trademark for their new product, they will receive a Notice of Allowance from the USPTO. They must then file a Statement of Use within six months to prove that the trademark is being used in commerce, such as on product packaging or in advertising.

Another example would be a clothing brand that has registered a trademark for their logo. They must file a Statement of Use to prove that the logo is being used on their clothing items and is not just a concept or idea.

The examples illustrate that a Statement of Use is necessary to prove that a trademark is being used in commerce and is not just an idea or concept. It is a legal requirement for trademark registration and must be filed within a certain timeframe.