You may already know Ergo is using the UTXO model, with means we have some inputs and outputs, and the container that contains this data is called a box.
In Ergo, we can divide the data and name them with registers.
Each box can have at least four [R0-R3] and a maximum of 10 registers.
The R0-R3 registers define the value (NanoErg), guard script, assets, and creation info.
This is an example of a box:
{
"boxId": "b8ce8cfe331e5eadfb0783bdc375c94413433f65e1e45857d71550d42e4d83bd",
"value": 1000000000,
"ergoTree": "10010100d17300",
"assets": [],
"creationHeight": 0,
"additionalRegisters": {
"R5": "0e42307864303761393732393334363864393133326335613261646162326535326132333030396536373938363038653437623064323632336337653365393233343633",
"R6": "0e464272657869743a20626f746820546f727920736964657320706c617920646f776e207269736b206f66206e6f2d6465616c20616674657220627573696e65737320616c61726d",
"R8": "0e45d094d0b8d0b2d0b8d0b4d0b5d0bdd0b4d18b20d0a7d0a2d09fd09720d0b2d18bd180d0b0d181d182d183d18220d0bdd0b02033332520d0bdd0b020d0b0d0bad186d0b8d18e",
"R7": "0e54e8bfb0e8af84efbc9ae5b9b3e8a1a1e38081e68c81e7bbade38081e58c85e5aeb9e28094e28094e696b0e697b6e4bba3e5ba94e5afb9e585a8e79083e58c96e68c91e68898e79a84e4b8ade59bbde4b98be98193",
"R4": "0e4030303030303030303030303030303030303031346332653265376533336435316165376536366636636362363934326333343337313237623336633333373437"
}
}
You can read more about the boxes in ErgoDocs.
Image Credit: Phemex Academy