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Elements Of Pawns In Chess
85% of the credit goes to Hans Kmoch, because I've taken most of this info from his book: Pawn Power In Chess.

Elements Of Pawns In Chess

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Master_Of_Graham
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   Hello everyone! Today I've decided to take My Christmas present from @DonkeyLowHead, Pawn Power In Chess, and use it for a blog post. 

                                                                                                                                                                          Pawn Power In Chess by Hans Kmoch

    Let's get right into it.

----The Elements Of Pawns In Chess----

    1.  The Ram: The ram is mainly used for defensive purposes. It is two pawns locking horns with each other without any direct tension. Hence the name. In fact, one of the most popular chess openings in the world is a ram. 1. e4 e5 is a ram. 1. d4 d5 is a ram. 1. c4 c5 is a ram, etc. There are a few reasons why rams are great defenses. The first reason is that a ram stops the enemy opponent from advancing his pawn to the square in front of it, so knights can be placed on their good squares without getting kicked. The second reason is that there is indirect tension with a ram, not letting your opponent take advantage of direct tension like levers sometimes do.

                                                                                     

                                          "1. e4 e5 is a ram."                                          

   2. The Lever: The lever is the opposite of the ram. Levers instead of creating indirect tension, create direct tension, meaning that the pawns can capture each other. Sometimes, though, levers can be bad if it allows your opponent initiative for an attack. The Scandinavian Defense is an okay lever because there is no tactic for white that makes the lever bad.  

The Scandinavian Defense 
    3. Duos and Trios: Duos and trios are the cousins of doubled pawns. Just like doubled pawns, they can have potential or they don't have potential. If you want to know why sometimes doubled or tripled pawns have potential, go to my other blogpost: https://www.chess.com/blog/Imaged_Bishop/when-doubled-pawns-are-good to learn when they are good.
I have not said what duos and trios are. Duos and trios are just doubled pawns or tripled pawns. But instead of being vertical, they are horizontal. Like the starting position on a chess board. 
           
"Like the starting position on a chess board."
    4. Chains: Chains are one of the most simple elements of pawns to understand. A chain is a diagonal pawn structure where all the pawns defend each other, except for the base pawn. The base pawn is the pawn at the bottom of the chain, making it the weakest pawn in the chain because it does not have any defenders looking out for it like the other pawns do. While chains are a simple element of pawns, chains are one of the most powerful at the same time.
                                             
This is a pawn chain with two base pawns, the a and the h pawn.
                                       
  Thank you guys for reading! Stay tuned because I'm going to make a blog post on the states of pawns soon.