Pilots are in charge of operating an aircraft, known mostly for the transportation of passengers and cargo. They work on various types of aircraft and have different fields of expertise, depending on their experience and licensing. The Private Pilot License (PPL) is for Pilots who fly for leisure, and the Commercial Pilot License (CPL) is for Pilots who are career-pilots. For example, a pilot employed by a commercial airline would not be certified to fly with only a PPL license. Pilots can work in private and public sectors, and their ultimate role is to oversee and operate the aircraft in a safe manner.  
  
Another core responsibility for a Pilot is to ensure the safety of all passengers on board. It means that they must confirm all systems are in operation before taking flight, including checking the fuel levels, testing all of the systems, and coordinating with maintenance and crew. Pilots can work directly with several departmental bodies, including the ground crew, their co-captains, the flight attendants, and their passengers.  
  
What a Pilot's role entails is dependent on which professional setting they choose. However, there are consistent roles and responsibilities that Pilots have, and interested candidates should take notice 
 
Roles and responsibilities of a Pilot

• Working as part of a team with crew members
• Giving instructions to the crew on board
• Coordinating take-off and landing procedures with crew members
• Informing the crew of any news regarding the aircraft or the flight
• Running a check-up of all systems with Flight Engineers before flights 
• Ensuring that all systems are working correctly
• Checking passenger and cargo distribution to ensure proper balance of weight
• Calculating fuel consumption based on weight of the aircraft and the distance of the flight
• Reporting any malfunction to Engineers 
• Piloting the aircraft
• Starting engines and following take-off procedures; 
• Using instruments to fly with low visibility
• Operating controls and flying during turbulence 
• Steering the aircraft on pre-established routes
• Following flight patterns and routes
• Calculating fuel consumption based on speed and weight of the aircraft
• Monitoring engine operation, fuel consumption, and other systems during flight
• Maneuvering the aircraft into the best altitude and speed
• Making in-flight announcements
• Consistent communication with air traffic control
• Preparing for landing following the applicable procedures
• Redesign the route and flight patterns when needed
• Contacting air control towers
• Requesting takeoff and landing clearances and instructions
• Reporting location and status of the aircraft 
• Communicating with other vessels to coordinate movements
• Responding to and reporting in-flight emergencies 
• Reporting equipment malfunction
• Notifying air traffic control of emergencies, problems, hazards (e.g., high-jacking, possible explosive devices, or medical emergencies)
• Following the established emergency procedures
• Update the aircraft’s log with all eventualities

Flies an air craft to it's destination, or   to move forward or give direct energy outward. I gave two meanings of what I believe to be the correct way of relating one word "Pilot". Well I had to read then reread multiple times because it's ask in an indirect way. Meaning, the word pilot alone has a different definition which would be a device used in old hot water heaters or old furnace's to guide the gas fumes for a lit flame at all times. And then there is pilot a person with the capability and license to taxi people and things around thru the air safely. But because your question was only about a pilot noting else I'm going to use my knowledge of the answer as fallows.

1. A pilot flies large aircrafts

2. A pilot is a valve to guide gas to it's destination