What is Abstract contract in solidity

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S O L I D I T Y
A B S T R A C T C O N T R A C T

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What it is ?
What is abstract
contract in solidity ?

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Abstract Contract
Contracts are knows as abstract when one of the function in that contract lacks
implementation.
pragma solidity ^0.4.0;
contract member{
string name;
function setName() public returns (string);
}

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Abstract Contract
Another contract can inherit abstract contract and implement the function.
pragma solidity ^0.4.0;
contract member{
string name;
function setName() public returns (string);
}
contract teacher is member{
function setName() public returns(string){
return "Mark";
}
}

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Facts
Abstract functions can't be complied
If a contract inherits from an abstract contract and does not implement all non-implemented
functions by overriding, it will itself be abstract