•  Inheritance is a method to inherit the properties of the parent’s CLASS by the child class. 
•  Inheritance is used in Object oriented language and it deals with the real world objects and information. 
•  The data in these scenarios is treated as an object and it has the characteristics like size and the actions that are performed on them. 
•  In inheritance a class is DEPENDENT on another object. The child object inherits the properties of the parent’s class and uses it. 
•  Child class has its own features but it ALSO inherits the properties or the features from the parent’s class. 

The EXAMPLE shows it:

Type
TBall = class
protected
ballSize : Byte;
published
procedure KICK(power : Byte);
function GetSpeed : Byte;
constructor Create(size : Byte);
end;

TFootball = class(TBall)
private
ballPanels : Byte;
published
constructor Create(size : Byte; panels : Byte);
end;

The example shows it:

Type
TBall = class
protected
ballSize : Byte;
published
procedure Kick(power : Byte);
function GetSpeed : Byte;
constructor Create(size : Byte);
end;

TFootball = class(TBall)
private
ballPanels : Byte;
published
constructor Create(size : Byte; panels : Byte);
end;