What is Enthalpy and How Does it Relate to Heat and Pressure?

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What is Enthalpy? I mean how is it different than heat. Also Enthalpy= change in energy+pressure*(change in volume). I don't understand where the PV comes into play in this equation.
 
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abcbac said:
What is Enthalpy? I mean how is it different than heat. Also Enthalpy= change in energy+pressure*(change in volume). I don't understand where the PV comes into play in this equation.

It can also be usefull to look around in this forum, for example at:
https://www.physicsforums.com/showthread.php?t=338573