A more thorough explanation:

Definition: A boutique is a small business that specializes in a particular area. For example, a boutique law firm may specialize in one specific area of law, such as tax law.

Example: A tax boutique is a small law firm that specializes in tax law. They may only take on clients who need help with tax-related legal issues.

Explanation: The example of a tax boutique illustrates the definition of a boutique because it is a small business that specializes in one particular area of law practice. This type of boutique may have a smaller client base than a larger law firm, but they are experts in their field and can provide specialized services to their clients.