Faucets are using a service called Microwallet as a place where payments are stored before being sent to you.
When a transaction takes place on the Bitcoin network it is sent to the blockchain where it is confirmed (this takes time) and a transaction fee is charged. With Microwallet the owners and operators of faucets send coins to an address and they are stored to later be divided up off the chain immediately.

This allows for faucets to send a message to the Microwallet site saying that you have received some coins and they move it internally from the faucet address to your Microwallet address. Once you have reached a threshold the coins are available to you as an end user to be withdrawn which is when the transaction goes back on the blockchain.

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Coinbase is the MOST TRUSTED CRYPTO Wallet

FOUNDED IN JUNE OF 2012, COINBASE IS A DIGITAL CURRENCY WALLET AND TRADING PLATFORM WHERE MERCHANTS AND CONSUMERS CAN TRANSACT WITH NEW DIGITAL CURRENCIES LIKE BITCOIN, ETHEREUM, AND LITECOIN.

Create Coinbase Account

SPEND BITCOIN LIKE A LOCAL WITH WIREX VISA CARD.

INSTANTLY EXCHANGE AND SPEND ANY DIGITAL AND TRADITIONAL CURRENCIES USING YOUR CARD. USE YOUR WIREX VISA CARD AT 40M+ OUTLETS AROUND THE WORLD, IN-STORE, ONLINE OR AT ATMS.

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Bitcoin was invented by an unknown person or group of people using the name, Satoshi Nakamoto, and released as open-source software in 2009. Bitcoins are created as a reward for a process known as mining. They can be exchanged for other currencies, products, and services.

Nakamoto implemented the bitcoin software as open-source code and released it in January 2009. Nakamoto’s identity remains unknown.

Bitcoin is the world’s most widely used alternative currency with a total market cap of over $190 billion. The bitcoin network is made up of thousands of computers run by individuals all over the world.

Bitcoins are divisible into smaller units known as satoshis — each satoshi is worth 0.00000001 bitcoin.​

[youtube https://www.youtube.com/watch?v=adYby26h-0A]