• child class can use properties of parent class
• e,g

// Parent class
// Vehicle.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.0;
contract Vehicle {    
	string public brand;
   constructor(string memory _brand){
	    brand = _brand;
	 }
   function description() public pure virtual returns (string memory){        
    return "This is a vehical";    
   }
 }

// Child class
// Car.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.0;

import "./Vehical.sol";

contract Car is Vehical{    
	uint public numberOfDoor;
  
  constructor(string memory _brand, uint _numberOfDoor) Vehical(_brand){        
	  numberOfDoor = _numberOfDoor;    
  }
  
  function description() public pure override returns (string memory){        
  return "This is a car";    
  }
}