Hi Mohamed --

The deformations on both sides of your coin are called "Post Mint Damage" which means they happened after the coin left the mint. Post mint damage makes a coin less valuable to collectors.

"Error Coins" are coins with deformities that were caused by the mint. Error coins are valuable. 

For samples of error coins, see this page:

https://coinquest.com/cgi-bin/cq/coins.pl?genre=120