spokesman
A person chosen to speak for a group in public.
A spokesman is a person chosen to speak publicly on behalf of a group, organization, or company. When a school principal asks a student to be the spokesman for the student council at an assembly, that student represents everyone's ideas and concerns. When a company announces a new product, they often have a spokesman explain it to reporters and customers.
The job of a spokesman is to communicate clearly and accurately what the group thinks or wants to say. A good spokesman understands the message thoroughly and can answer questions confidently. When NASA announces a space mission, their spokesman needs to explain complex scientific ideas in ways people can understand.
The word traditionally used the masculine form “spokesman” regardless of gender, though today many people use “spokesperson” or “spokeswoman” to be more precise about who's speaking. You might also hear the plural spokesmen or spokespeople. The key idea remains the same: this person's words carry weight because they represent others who have chosen them to deliver an important message.