# Data Type Guide
| Prefix      | Data Types       | Communication                                  | Description |
| ----------- | ---------------- | ---------------------------------------------- | ----------- |
| id_         | GUID             | VARCHAR(50)                                    |             |
| ds_         | varchar(x)       |                                                |             |
| tx_         | Text Large       |                                                |             |
| dt_         | Datetime         |                                                |             |
| bl_         | Boolean          |                                                |             |
| vi_         | int              |                                                |             |
| en_         | int              | Enum type, defined and controlled at api layer |             |
| vr_         | decimal          |                                                |             |
| js_         | JSON Document    | JSON encoded string                            |             |
| bb_         | Blob binary file |                                                |             |
| im_         | Image file       | form post file field type                      |             |
| ar_         | Array            | JSON encoded string of array                   |             |
| ur_         | url              | just a url                                     |             |