Dogecoin was one of the oldest coins in this crypto market. The current price of the dogecoin is less but yes it is highly popular for its pump and dump activity just like your chart is showing us. I personally myself holding Dogecoins from past more than one year and expecting to sell with a profit of almost  60% of returns soon. It doesn't have any big value other than pump & dump activity and people are focusing just on mining dogecoin because it is so simple and cheap to mine them and this is the reason even i think it is going to fail soon.