In wide format, all the features of an instance are provided in a single row with each feature being indicated in separate columns whereas, in the long format, a particular instance is repeated in each row with different attributes, i.e. in the long format, only one attribute is specified in one row. The following tables are examples of long and wide formats:
| Name | Age | Blood Group |
| Siddhartha | 23 | AB+ |
| Sahil | 22 | A- |
Wide Format
| Name | Attribute | Value |
| Siddhartha | Age | 23 |
| Siddhartha | Blood Group | AB+ |
| Sahil | Age | 22 |
| Sahil | Blood Group | A- |
Long Format
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