A more thorough explanation:

Definition: A specialist is someone who has expertise in a specific field or area.

Examples:

• A lawyer who has been board-certified in a specific field of law is considered a specialist. For example, a lawyer who is board-certified in family law is a specialist in that area of law.
• In the securities industry, a specialist is a member of a securities exchange who makes a market in one or more listed securities. The exchange assigns securities to various specialists and expects them to maintain a fair and orderly market as provided by SEC standards.

The examples illustrate that a specialist is someone who has advanced knowledge and skills in a specific area. They are recognized for their expertise and are expected to maintain high standards in their field.