# Case Studies / Sending bitcoin
Bitcoin wallets don't have a balance in the conventional sense. Instead it keeps track of all the previously received [UTXOs](https://bitcoin.design/guide/glossary/#unspent-transaction-output-utxo). The balance applications usually show is actually a total of those UTXOs available to spend.

Choosing if you are optimising for privacy, lower transaction fees, or speed are things you also need to factor into the design into the payment expereince. Your choice will directly impact the amount of steps the user needs to make.

You will also need to consider what enviroment the application will be used in. If you are paying a vendor at your local market you probably won't have their contact details to exchange a payment request via chat. Scanning a QR Code to get an address would likely make more sense in this situation also than manually typing it.

## Simple send

### How it works
Usually on a send screen, the user enters an amount they wish to send, then pastes in the address where they want to direct the payment to.

The application can sometimes detect if an address has been copied to the clipboard and automatically paste it into the address field.

### Pros
- Low friction, it easy for end user, as they don't have to select coins to fund the transaction with manually.
- Wallets can decide automatically if to optimise the transaction for cost, speed, or the change that would be returned depending on the targeted user group.

### Cons
- Does not provide the level of control for more privacy concious users.

### Best practices
#### When to use
- New Users or introductory wallets
- Wallets that wish to prioritise cost or transaction speed

#### When not to use
- When privacy is a concern to users

#### Products that use this scheme
- Bread Wallet + Electrum (FIFO)
- Mycelium (Pruned FIFO)
- BitcoinJ and Bitcoin Wallet for Android (High Priority First)
- Electrum *Private Mode (Target Sized Change)
- Bitcoin Core (Branch and Bound)
- Hexa (Blackjack, with Accumulative Fallback)

## Manually selecting coins to fund a transaction
With manual coin selection the
### How it works
### Best practices