What is aerofoil and its parts ?

Aerofoil : In American English its airfoil and in British English aerofoil   . It is a shape of  wing , blade ( of propeller , rotor or turbine ) . There are so many designs of aerofoil . The parts of aerfoil are as follows :

1. Chord line : It is imaginary straight line which connecting the leading edge and trailing edge . 
2. Camber line : It is curved line which divide upper camber and lower camber equally .
3. Leading edge : It is point at the front of the aerofoil  having maximum thickness . Some of control surface are present here also . 
4. Trailing edge : It is point at rear portion of aerofoil . Many control surface are installed in trailing edge  of the wing . 
5. Maximum thickness : It is maximum distance between the upper surface and lower surface of aerofoil . 
6. Maximum camber : It is maximum distance between the chord line and the camber line . 
7. Upper surface : It is upper curvature from the camber line of aerofoil . 
8. Lower surface : It is  lower curvature of aerofoil . 
9. Angle of attack : It is angle between the chord line of aerofoil to the relative air flow .