The Stellar distributed network can be used to track, hold, and transfer any type of asset: dollars, euros, bitcoin, stocks, gold, and other tokens of value. Any asset on the network can be traded and exchanged with any other.

Other than lumens, all assets have:

• Asset type: e.g., USD or BTC
• Issuer: the account that created the asset.

Read more here.

On Interstellar, the asset balances for an account appear on the account's homepage as shown below.