Yoroi, is an extension, for firefox. It is an ADA wallet, and you can stake ADA, with it. For more information look at the wallet's website
Dogecoin is a fun, new and rapidly growing form of digital currency. This form of digital currency is called "cryptocurrency"; a type of digital currency. Cryptocurrency is completely anonymous, decentralized, and extremely secure.
Dogecoin is used with a wallet on your computer, your smartphone, or a website. You can use it to buy goods and services, or trade it for other currencies (both other cryptocurrencies or traditional currency like US dollars).