Daedalus is a full node wallet. This means that unlike light wallets (e.g.Yoroi, Adalite etc.) Daedalus downloads a full copy of the Cardano blockchain.
Nami Wallet is a browser based wallet extension to interact with the Cardano blockchain. Nami allows to store and send multiple assets.
Yoroi is a light wallet for Cardano. There is no need to download the blockchain when you open the wallet. The browser extension is fast. Has Android and iOS supprt.