What are teams and entrants in INDYCAR?

Section 4: Players/Officials

Drivers must hold a valid INDYCAR license for the category. New drivers, and drivers returning to a circuit type, complete a Rookie Orientation Program or refresher, particularly for oval and superspeedway running.
Indianapolis 500 participation requires completion of the Indianapolis-specific orientation/refresher and approval by INDYCAR.

Each entrant fields one or more cars, each with an assigned car number, and is responsible for the car's compliance with the rulebook.
Crew members working on pit lane must be registered and wear required protective equipment.

Race Director: The senior race official, responsible for the conduct of the event — starts, restarts, caution and red-flag decisions, and the application of penalties during the race.
Stewards: A panel that reviews incidents, hears the entrant's position, and issues or confirms penalties; certain decisions may be appealed under the rulebook.
Technical inspectors: Inspect cars before and after sessions for compliance with the technical regulations, including post-qualifying and post-race checks of the cars at the front of the field.
Starter and flag crew: The starter controls the start and displays flags from the starter's stand; flag marshals operate the corner stations.
Timing & scoring: Maintains the official running order, lap counts, and timing using the transponder/loop system.
Pit officials: Monitor pit-lane speed, releases, and pit-box work for safety and compliance.
AMR INDYCAR Safety Team and Medical: The series' traveling safety and medical personnel, stationed around the circuit for rapid response.

Drivers must hold a valid INDYCAR license for the category. New drivers, and drivers returning to a circuit type, complete a Rookie Orientation Program or refresher, particularly for oval and superspeedway running.
Indianapolis 500 participation requires completion of the Indianapolis-specific orientation/refresher and approval by INDYCAR.

Each entrant fields one or more cars, each with an assigned car number, and is responsible for the car's compliance with the rulebook.
Crew members working on pit lane must be registered and wear required protective equipment.

Race Director: The senior race official, responsible for the conduct of the event — starts, restarts, caution and red-flag decisions, and the application of penalties during the race.
Stewards: A panel that reviews incidents, hears the entrant's position, and issues or confirms penalties; certain decisions may be appealed under the rulebook.
Technical inspectors: Inspect cars before and after sessions for compliance with the technical regulations, including post-qualifying and post-race checks of the cars at the front of the field.
Starter and flag crew: The starter controls the start and displays flags from the starter's stand; flag marshals operate the corner stations.
Timing & scoring: Maintains the official running order, lap counts, and timing using the transponder/loop system.
Pit officials: Monitor pit-lane speed, releases, and pit-box work for safety and compliance.
AMR INDYCAR Safety Team and Medical: The series' traveling safety and medical personnel, stationed around the circuit for rapid response.