What is Dogecoin?
Dogecoin is a cryptocurrency featuring a likeness of the Shiba Inu dog from the "Doge" Internet meme as its logo. It was introduced on December 8, 2013 gaining traction as an Internet tipping system.

Differences between Dogecoin and Litecoin
Dogecoin's implementation differs from Litecoin by several parameters. Dogecoin's block time is 1 minute as opposed to Litecoin's 2.5 minutes.

Tipping and fundraising
The Dogecoin community and foundation have encouraged fundraising for charities and other notable causes. Social media users grant Dogecoin tips to other users for providing interesting or noteworthy content.
Amount of coins
Dogecoin has a fast initial coin production schedule: there will be approximately 100 billion coins in circulation by the end of 2014 with an additional 5.2 billion coins every year thereafter.
Currency supply
Unlike deflationary cryptocurrencies (like Bitcoin), there is no limit to how many Dogecoins can be produced. This puts Dogecoin in the same league as other inflationary coins.