A meeting poll is a short vote used to find a time that works before anything lands in calendars: the organiser proposes several slots, attendees tick the ones they can make, and the winning slot becomes the meeting. Tools such as Doodle, When2meet and LettuceMeet popularised the pattern for groups whose calendars cannot be seen in one place.
Inside one organisation on a shared calendar system, polls are usually unnecessary; free-busy lookup answers the question instantly. Polls earn their keep across organisations, with external guests, or for large optional sessions. Once the time is settled, the practical step remains the same as any other meeting: book the room, invite the guests, and let check-in release it if plans change.